There is a difference between facebook/twitter that disallow those things, will remove them and app that when presented with those behaviours says that they are welcome. You know that.

Unfortunately nobody taking a stance will lead to that horrible behaviour increasing.

The argument "Because X and Y have similar technical implementations in what users can do" is irrelevant here, it's about the intent/goals/policies/how widespread it is.

I welcome anything that reduces hate speech that is officially accepted on some platforms. That is a real problem and one that needs to be dealt with in any way possible.