No no no no no. This sounds like a nice idea on the surface but it would be terrible. It would destroy the fungibility of Bitcoin, making some coins worth less

No no no no no. This sounds like a nice idea on the surface but it would be terrible. It would destroy the fungibility of Bitcoin, making some coins worth less because they could only be spent freely in countries that don't follow the same blacklists, or on the black market. It would be a huge fucking mess.