Don’t conflate this story with “banned for no reason”. There are plenty of reasons to ban Gab.
But illegality is not the issue here. People simply have a right not to be associated with hate.
This is neither a right in any theoretical system of human rights I've seen, nor is there any practical way to disassociate people from a basic human emotion.
Also, don’t be cute about “hate”. We aren’t talking about the human emotion and you know it.