I still have the bitcointalk username of the impersonator. Do you think I should make it known to everyone here by posting the username?
There are many scammers that do this kind of things, the participate in bounty campaigns with your credentials and with their ETH address.
The big problem is that you can't do anything to stop them. It's up to the bounty managers to have a scam list of ETH addresses, that's pretty much it.