Artists dump X as launch of new AI image editing feature sparks outrage - Cryptopolitan
(www.cryptopolitan.com)
I wasn't going to log in to verify either lol.
Even if that's the case, it will come down to fair use policy which will allow quite a lot.
If the specific instance of sharing isn't fair use and Twitter allows it, then sue them, someone will. Reddit for example though is just littered with modified images and they've been fine. Same with Lemmy.
Edit: If someone starts trying to make money off modified images via Grok, then that becomes a much easier case to win.