It's always weird and fun to watch them slide deeper into the abyss.
Animu avatar =
First 2 - 3 months on Twitter > some gaming talk, perhaps a weeaboo Samus cosplay once in a while, dipping their toes in something like Gal Gun or Senran Kagura for the 'gameplay'.
Next 4 - 6 months > increased posting of NSFW fan-art / retweeting Patreon 'artists' (this is when I notice the change)
Final 2 - 3 months > Loli animu, Goku x Pikachu x Princess Peach, dripping manga faces, tentacles (OH GOD, unfollow/block/ban)
It goes the same with the Patreon artists. They start out by sharing some cosplay photo's and a month later they're selling 'lewd' images followed shortly by softcore (or even hardcore) porn.
From a psychological point of view for most of those girls the barrier from 'anonymous on the internet' to 'dressing up for pictures and publicizing them' seems bigger than 'dressing up for pictures' and 'dressing up for pictures while giving head' .