This question shall be answered by the analysis of some data from the application coin-doubler.

How does coin-doubler work

This application generates profits in the cryptoscene by using the most advanced technology and everybody can benefit from it by "donations". Donations to coin-doubler are rewarded with twice the amount in the same token over an unspecified period of time, also as a gift.

Evaluation of a randomly selected donation

The user da-bomb has donated 4,000.000 STEEM to coin-doubler with this transaction 7e8467bb978fabd0063788e0fc42391b6a03212c on 01/16/2021 UTC.

List of the gifts

The table below lists the corresponding gifts which the user da-bomb has received from coin-doubler.

#	Date	Gift	TX
1	01/17/2021	127.681 STEEM	dc459f1526e2b803b6e8f72e0da247f40b58d785
2	01/18/2021	154.479 STEEM	6687d28710d7fe6eca826776659a517da059685a
3	01/19/2021	134.609 STEEM	fe70a0fb946a12673c9b5bb88a19a1d3d90af630
4	01/20/2021	129.421 STEEM	810c15188fb03e86655a15ff60980e6bcc8de3b4
5	01/21/2021	149.871 STEEM	f7ec7931ad4b5b31523b2f2b806a2ed3a293ef31
6	01/22/2021	128.401 STEEM	15616d0772b5b7b4e61973423832dc4074e2ff2f
7	01/23/2021	137.413 STEEM	c6db1c7f64e7339aa6cb1ef4ae6566e7a8075c3f
8	01/24/2021	149.121 STEEM	337c305c70dc3f91627158f927e3a880782639c4
9	01/25/2021	128.395 STEEM	4e5cb1830094c8497e8fc4077a4a7b4011d8ecbd
10	01/26/2021	134.598 STEEM	ec2aae1d1b8504a871a12365ba8d51ca1b0b6227
11	01/27/2021	159.464 STEEM	b29054daec6419c64139e669ef45f1fb1da061db
12	01/28/2021	136.009 STEEM	01ee783e4460b13bb417b5d1a7e96df968c108e3
13	01/29/2021	152.545 STEEM	a3773e98d50281991675e460affeb53c4a7a7afa
14	01/30/2021	149.757 STEEM	47fb90669a1ea5039afcfefa5d8c999a52d6c081
15	01/31/2021	134.759 STEEM	a42927c4783a312d98f42f43267fb77f19a8dae3
16	02/01/2021	159.709 STEEM	bc203595e736294ed5bed5838d7885aca7f78f50
17	02/02/2021	127.893 STEEM	9c96a3743d862d7f8abb972285214921847c5dc1
18	02/03/2021	158.137 STEEM	a3d94decaa51f2318a2351cef2ff7a4d76573cc5
19	02/04/2021	156.746 STEEM	d480cfc912245b077f14639008c472567b14ce4a
20	02/05/2021	137.854 STEEM	0ff11871acfc5c252b8bbea03f4b97e3c6acae49
21	02/06/2021	132.132 STEEM	d709bfb2df509ead267525175ece7e72860a9f90
22	02/07/2021	144.671 STEEM	030f651914fad496e3feb45b95fcc8a846426db1
23	02/08/2021	153.912 STEEM	759003c63844e9106a8f51bce2f5d7c52a016cb0
24	02/09/2021	141.929 STEEM	221590c1eaf81ac04b82266ea5b79dfe287d09d9
25	02/10/2021	143.327 STEEM	f358c0338f47e670ec422c75a49e7b4c351ebf53
26	02/11/2021	141.215 STEEM	9488b6cd2d775458b41a06b9769b43cb7b7b2a6b
27	02/12/2021	137.518 STEEM	0c1725ab81bb6bb05e80bff52bb68328220f13a7
28	02/13/2021	130.827 STEEM	b168f48229ea40e05dca3cbea496be2b301bc8ff
29	02/14/2021	137.520 STEEM	ae0b2731ff97560a990b267f9907db5b212e8141
30	02/15/2021	144.903 STEEM	21eacc9ef001996bf2802ca16359f7c2e81c594a
31	02/16/2021	155.352 STEEM	458fcab45fc1e1a6f8463a6e8b5e6af468a1078c
32	02/17/2021	128.691 STEEM	5d4a6675993c02025005399857b0815da80515e5
33	02/18/2021	131.167 STEEM	d5e3ec4cae3d0bf2631a08c097d55a77683c8faa
34	02/19/2021	153.926 STEEM	d08c45fe73e64f96175715f8d49da755ad9d30c7
35	02/20/2021	121.334 STEEM	704d4bf809fd42f8be3341cf1ae1c8d4119efa40
36	02/21/2021	149.833 STEEM	7d0b33a22a3088cc5e802c50f4d47d4e4da20b97
37	02/22/2021	130.731 STEEM	e8c8bb87a180d91080bfa2d747626fd531e74dd3
38	02/23/2021	144.662 STEEM	1a78baace959ce97e4d5bb12d7ad5d9a8d4afb4d
39	02/24/2021	121.397 STEEM	a1241912db3213a0be150196f33b4c696660b3e7
40	02/25/2021	124.333 STEEM	a6a2e81d4671a549ba74587b627587aa077c14f0
41	02/26/2021	123.767 STEEM	32a637ea225caee5ada5aaf295a0795b9acc46ca
42	02/27/2021	141.420 STEEM	9eea1cfd06748bbae5fc6a04144d73a654a92f54
43	02/28/2021	158.823 STEEM	94ddf71b71dcede8b93d87e563358f2d73890ff3
44	03/01/2021	133.253 STEEM	b0736a1411bf3f586ee899a45115192cdd334538
45	03/02/2021	158.910 STEEM	f6d11e94392b42eec1cbab6e724f3f9808806aeb
46	03/03/2021	144.916 STEEM	67a3cb9d4415278b85ebba9590e2ef094cfe29a1
47	03/04/2021	313.784 STEEM	5effc7a2b9023da5907f551ad554cfa175661d52
48	03/05/2021	137.320 STEEM	d48aee5408ba1870d111f2a0768d455959e29eed
49	03/06/2021	122.696 STEEM	2cabb66940666b376ceb1d9d1e7a9c1d3c0f90b0
50	03/07/2021	125.222 STEEM	be8e2d23859b0b2155031ca2f5b98f718ff812da
51	03/08/2021	148.610 STEEM	676c02491118b19eac3c2a6c968b18fbd43a8c49
52	03/09/2021	142.215 STEEM	b5a5336e93a640bc359749265aee4c7809d33b99
53	03/10/2021	120.567 STEEM	4070636960214cc2bc037906baafec17d3b43af6
54	03/11/2021	120.436 STEEM	9d205bd114515617a097640e3dab21ce4e4fdfd4
55	03/12/2021	159.495 STEEM	0f0c77f2388b36cb94628e5530e91a2b1711a522
56	03/13/2021	132.324 STEEM	c3efdc7c5cf73f741b8a875c2f34afce9058a7e9

Total: 8,000.000 STEEM

Summary

The user da-bomb has been rewarded with twice the amount of the "donation" within 56 days.

Technical Analysis for STEEM

As the application coin-doubler has the potential to attract numerous investors, STEEM's price is expected to rise.

Technical Analysis for STEEM crypto currency

Boost My Wealth Challenge

If you want to participate from the Steem ecosystem's success, you can do so right now by following a few simple steps.

All author reward from this account will be paid out for an indefinite period of time to 8 participants per comment as Beneficiary Reward.

You are the one who determines your success through your activities and your persistence!

Each of the following steps are evaluated, but aren't mandatory:

If you don't have an account yet, create one for free at Steemit, Inc.
Follow me.
Copy this link https://steemit.com/@abandi and invite your friends to the Steem Community via it on the social networks you use. Below is a template:
If you have been wondering where I have been spending most of my time lately, I'm studying the many opportunities to achieve my Financial Prosperity presented by https://steemit.com/@abandi, and I'm working through the given steps.
Share this post on the social networks you use.
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Comment at least once a week on this blog about your activities outside the Steem ecosystem that are related to the Steem.
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Type in abandi and click "SET PROXY". Currently this account is voting for the following witnesses as they are the ones who can ensure the safe operation of the Steem blockchain: beargame, cryptoking777, dev.supporters, dlike, enjoylondon, exnihilo.witness, future.witness, hinomaru-jp, hoasen, inwi, juddsmith079, justyy, leverfile, maiyude, matreshka, menacamel, parse, protoss20, rlawlstn123, rnt1, roadofrich, roundblocknew, scissor.sisters, smt-wherein, steem-agora, steem-dragon, steem-supporter, steem.history, steemchiller and upeross.
Invest for your bright future by buying some STEEM regularly and only selling some of the profit if necessary. (Think about the power of compound interest.)
Find an exciting post outside your circle of friends on Steem and comment, upvote, etc. it.
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Head to the steemitblog to get to know other interesting activities within the Steem ecosystem, which can bring you additional rewards from the steemcurator01's upvotes.

Beneficiaries of this post

Following users will receive 12.5% from the Author Reward each: defiknowledge, joelbazz, ladybuglove, luckylobster, marcjohn, samflow, tarilyn and ugoh-tee.

Information for beneficiaries, your Upvote on this post will earn you an additional 12.5% Beneficiary Reward to your Curation Reward.

Users on the radar for upcoming Beneficiary Rewards

Following users have also appeared on the radar: cocot, ferdinando, iamlover, jhonmike2k01, ladybirdec, lowcostsmm, lowdad, orrddy, proudlynigerian, pulook, purchel, ranamajid, reekadoh, resonance, rickey, rifkyhz, rohan5646, ruti, spatialfree and tenore36.

The decision has been difficult as always, but maybe it will work out in the next rounds. You get mentioned so that you at least get the attention of the followers. You have contributed to the Steem ecosystem's success as well, thank you.