Since the account doesn't care about reputation and participated in the 1xBet campaign, and already got tagged. People unlikely to trust them and I don't think people will do any deals with them. So, It's a waste of time. Still, I am looking forward to community feedback.
Accounts can have as many feedbacks as possible, for many or the same reasons (from different members), if an account has a negative feedback for participating in 1xBet campaign, and you have solid evidence that the account changed hands, then you should leave a feedback that the account changed hands, that will help people who will visit their profile to know that the account changed hands. So long as the reason is different, a member can leave as many feedbacks as possible, what may be stupid to do is leaving more than one feedback for someone for the same reason.
Now, The question is; Should I expose those accounts that seem to have changed hands two-three years ago?
The choice is yours, but don't call anyone out without strong and solid evidence.