This is more of my personal axe to grind, but it's important to view this as a result of monetized content and highly algorithmic feeds. It is my understanding that these platforms don't even really remove this language, just demote it, but that the culture on these networks is entwined with people who post for money, so anything that reduces exposure or payout is shunned. This is true for TikTok, Instagram, YouTube (shorts).

That said I wouldn't even assume "s3xual" is a result of this. It smells of older censorship to me, all the new stuff is video-first, so phonetic substitutes are more characteristic.