As we know, there is a neighboring forum that is starting to get busy for some reason, and we can teleport the account there. So what happens if someone sells their account on a neighboring forum? Maybe it hasn't happened yet, but someday it might happen when the neighbor forum becomes bigger than it is now. (I mean selling teleport accounts from bitcointalk accounts)
That neighbour doesn't have a DT system, there's not even feedback like there is here. It exists, but it is very poorly implemented, so it cannot be considered relevant. So if someone sells their account in the neighbour's yard, it is certainly not part of the problem on Bitcointalk.
Certainly, there are administrators there too, who will react to the report in the case of impersonating someone else's profile from here. It is not particularly complicated if there is evidence and there is a desire to expose such accounts.