I mean, new!Twitter went through a phase of banning people for merely uttering the dread word 'mastodon'. They also, briefly, hilariously, memory-holed the word 'Twitter' (any occurrence of the string 'twitter' on the mobile app would be replaced with 'X', leading to a rare 2020s outbreak the Medireview Problem: https://en.wiktionary.org/wiki/medireview). And various other deranged petty nonsense.