I don't think anyone is such an idiot as to have an account with scam tags on BTT and want to teleport that account here, but I'm also telling you that I've seen stranger things when it comes to users. In case any user with tags tags was seen here trying to bring their account, that account would be immediately blocked with no possibility of using it again.
So we didn't have yet someone claiming his tags were an abuse on BTT and that he wants a fresh start and he's now good and he actually paid back the money, so on and on? Weird I would have expected a few to at least try, if they still take 5-10 minutes from their asking for loans nobody will give them what would be so extraordinary to try this new approach.
Anyhow, going through the replies, here, I think we should also think of another aspect, I feel like too many are focused on the misbehaving happening on BTT and then the users wants a fresh start here, now, how we would deal with this situation:
User A has a clean record on BTT, moves here, still has a clean record, and after a few months pass by he pulls a scam on BTT!
Will he also get tagged here, for a thing he has done outside the forum?
Would the usual excuse it's not my account anymore work?
If he has sold the account on which he gained ranks here by teleporting, would that mean he loses this one too?
I'm quite curious how others see this!
And of course

I apologize beforehand knowing damn too well how much headaches just analyzing those scenarios can cause to someone!