Without knowing the context of those bans, it's kinda hard to say whether your take of them being "simply for believing in the concept of copyright" is actually anywhere close to reality or not.
Based on past experience of people posting hyperbolic claims about "instance X banning people for Y", it's never actually about Y.
Depends on the amount of hyperbole, and getting banned for "believing in the concept of copyright" definitely smells like hyperbole.