Its coming from Tiktok. Bytedance has heavy word censorship and if one of your comments or videos was flagged as inappropriate and had one of those words your account would be automatically suspended for review.

So a lot of normal westerm words got flagged. Kill. Dead. Any word related to sex. Hole. (Lol) basically every curse word.

Then there are gray words like Pedophile where people think it changes the algorithm to show your videos less if they contain them, but no one has any proof from what I can tell.