I don’t think you can count the sites that just mirror Reddit comments.
Searching on lemmy.ml shows the top being several !news@hexbear.net megathreads with comments in the thousands, then that !asklemmy@lemmy.ml post you highlighted, more !news@hexbear.net threads, then a !meta@lemm.ee megathread about Hexbear’s federation. I guess we can see who comments the most.
I liked this !imageai@sh.itjust.works post Your username is the prompt, what did you get? which has 1618 comments.
This doesn’t affect me, but I’m sure there’s going to be a vocal tiny percent that absolutely hate this news.