Another option (viable to those wealthy enough to have a fleet of attorneys at their call) is to have everyone tip the fake calvin some $ and then the real Calvin could sue the fake calvin for profiteering off his identity (even if he took the avatar down, his name recognition in this space makes the intention clear)... then the fake calvin. Don't really like this line of thought... just thinking out loud (dangerous, I know!).
Another option (viable to those wealthy enough to have a fleet of attorneys at their call) is to have everyone tip the fake calvin some $ and then the real Calvin could sue the fake calvin for profiteering off his identity (even if he took the avatar down, his name recognition in this space makes the intention clear)... then the fake calvin. Don't really like this line of thought... just thinking out loud (dangerous, I know!).