Crappy remixes on TikTok and Instagram that can’t hold a candle to the hay day of YTMND?
The other poster is probably right, the indie game scene is pretty prolific with jams and remixes and has more collaboration than most early web phenomena.
I think that may be nostalgia talking. Some of the stuff my younger cousins send me from tiktok is genuinely hilarious - IMO definitely superior to ytmnd though YMMV.