Andreas Antonopoulos says that fungibility issue must be address to reduce risk of such third party control. He explains:
"we really need to address the issue of fungibility. Blacklists are inherently evil, as they seed control to the author of the blacklist and that control is absolute.".
https://www.youtube.com/watch?v=ak1iojpiHpM&feature=youtu.be&t=33m6s