and then another synonym would be used, and then another and another and by the end of month 1 you've banned half of the oxford dictionary and the kiddies have already moved on to ancient Aramaic. or more realistically diacritic/lookalike spam, good luck filtering that!
you could probably make some sentiment analysis system to autoflag things but why would you bother? i doubt tiktok really gives a shit, it doesn't have morals or a goal beyond its next quarterly report, as long as it can word "we're doing the barest minimum, fuck off" into something more polite it's all good in their books i reckon