I remember back in the old days on the Eve Online forums when the word cockpit would always turn up as "c***pit". I was quite amused by that.

This is actually a better solution, replacing dangerous words with placeholders, instead of blocking the whole payload. That at least gives the user some indication of what is going on. Not that I'm for any such WAF filters in the first place, just if having to choose between the lesser of two evils I'd choose the more informative.