There will be too many words we would have to block and players might still be able to escape it. If i block 'fuck' for example. the players can escape it using 'fu', 'fck' and that's just a single word, the server would have to check a lot more words every time player chat if we were going to implement such thing and it's such a waste of resource. Since we already have /ignore so i dont think it's worth it. If you dont want to deal with the player, the best option is to use /ignore so you wouldnt see even a single message of him/her.