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Children, stop writing ahh instead of ass I beg you
(hexbear.net)
This shit drives me up the wall even more than "unalive"
You can't stop people saying slurs but an entire generation will subconsciously alter their entire vocabulary because they grew up on corporate platforms with very heavily moderated text chats and comment sections and they ended up internalising the filters 
Edit: I was not aware of the AAVE origins of "ahh" which pushes it more towards the territory of legit slang. Still, I stand by my general point about automated moderation influencing language being bad
They're just using "ahh" because it sounds like AAVE, it was spoken before it was ever written in the comments on TikTok. Dodging moderation might be the cause of current popularity, but the origins are not that.
Censorship is a problem, sure, but you're specifically targeting the victims of the censorship instead of the perpetrators and that seems like an incorrect way to approach the problem. Should also consider all the stray bullets hitting people who have spoken that way before it even became a thing online.