There are a lot of different types of scammers active in bounty section. Protecting our IDs from them seems to be a challenge. Like you, I have had such a problem. A bounty cheater named DeXiam used my details to participate Butter Swap bounty and stolen my work in Amepay bounty. I put a negative trust on his profile. But since I am not a DT member, he does not care about it.
Proof:
Amepay bounty:
I posted my week 1 report on Oct 7
https://bitcointalk.org/index.php?topic=5279528.msg55329077#msg55329077.
Scammer copied my report and posted on bounty thread https://bitcointalk.org/index.php?topic=5279528.msg55334456#msg55334456.
Archive: https://archive.st/archive/2020/10/bitcointalk.org/i0s4/bitcointalk.org/index.html
Butter Swap bounty:
My week 1 report link:
https://bitcointalk.org/index.php?topic=5280065.msg55348152#msg55348152
Scammer's week 1 report link:
https://bitcointalk.org/index.php?topic=5280065.msg55353913#msg55353913
Then I put a negative trust on his profile but he still doesn't stop.
.
That's the problem, Proof:
Amepay bounty:
I posted my week 1 report on Oct 7
https://bitcointalk.org/index.php?topic=5279528.msg55329077#msg55329077.
Scammer copied my report and posted on bounty thread https://bitcointalk.org/index.php?topic=5279528.msg55334456#msg55334456.
Archive: https://archive.st/archive/2020/10/bitcointalk.org/i0s4/bitcointalk.org/index.html
Butter Swap bounty:
My week 1 report link:
https://bitcointalk.org/index.php?topic=5280065.msg55348152#msg55348152
Scammer's week 1 report link:
https://bitcointalk.org/index.php?topic=5280065.msg55353913#msg55353913
Then I put a negative trust on his profile but he still doesn't stop.
.Since we are not the dt, even if you put a red tag on this cheaters account, no one will be able to notice. So, it only means that the action you have taken is useless. The only thing we can do is to contact the bounty manager hoping that he will take an action.