Discovered the use of multi-accounts!
I did some research, and it turned out to find a person who uses multiple accounts in the same bounty.
First account: https://bitcointalk.org/index.php?action=profile;u=1770640
Bitсointalk name: cryptosinhaya
Wallet: 0xD0B74BAE747a7756644B1f453577449055693a6c
Wallet: 0x10fece049ce29848445d795df2c9887af4db0e28
Second account: https://bitcointalk.org/index.php?action=profile;u=1953594
Bitсointalk name: anusha208
Wallet: 0x4cbf94d21bcc1ee5b759db262473544c71101581
The archives of messages of the first account:
http://web.archive.org/web/20181006181622/https://bitcointalk.org/index.php?action=profile;u=1770640;sa=showPosts
http://web.archive.org/web/20181006181750/https://bitcointalk.org/index.php?action=profile;u=1770640;sa=showPosts;start=20
http://web.archive.org/web/20181006181820/https://bitcointalk.org/index.php?action=profile;u=1770640;sa=showPosts;start=40
http://web.archive.org/web/20181006181855/https://bitcointalk.org/index.php?action=profile;u=1770640;sa=showPosts;start=60
http://web.archive.org/web/20181006181924/https://bitcointalk.org/index.php?action=profile;u=1770640;sa=showPosts;start=80
http://web.archive.org/web/20181006182017/https://bitcointalk.org/index.php?action=profile;u=1770640;sa=showPosts;start=100
The archives of messages of the second account:
http://web.archive.org/web/20181006202519/https://bitcointalk.org/index.php?action=profile;u=1953594;sa=showPosts;start=0
http://web.archive.org/web/20181006202559/https://bitcointalk.org/index.php?action=profile;u=1953594;sa=showPosts;start=20
http://web.archive.org/web/20181006202630/https://bitcointalk.org/index.php?action=profile;u=1953594;sa=showPosts;start=40
http://web.archive.org/web/20181006202725/https://bitcointalk.org/index.php?action=profile;u=1953594;sa=showPosts;start=60
http://web.archive.org/web/20181006202818/https://bitcointalk.org/index.php?action=profile;u=1953594;sa=showPosts;start=80
http://web.archive.org/web/20181006202906/https://bitcointalk.org/index.php?action=profile;u=1953594;sa=showPosts;start=100
Transaction screens between wallets:
Screenshots of participation of accounts in the same bounty: