What will suffer, and possibly even disappear, are online comments sections. Yes, they're pretty much gone anyway because nobody besides Meta/Twitter wants to moderate discussions. But ChatGPT-driven bots will probably kill what little is left of organic conversations.
Of course making sure nothing is written using ChatGPT is impossible, but you can make sure the reader gains something from reading the book (whether that's insight or entertainment)
And how is it speciesism? LLMs are not biological entities nor conscious (yet, I guess).
We can do a thought experiment:
There is a runaway trolley hurtling down a track in the direction of a mediocre human science-fiction author, who is not even good enough to quit his or her day job. On a side track is a server holding the only trained copy of an experimental ChatGPT model which can generate science-fiction novels as good and original as Arthur C. Clarke and Ursula K. Le Guin combined, and at a massive scale. You can pull a lever to divert the trolley towards the server, destroying the ChatGPT model.
Do you pull the lever? As a self-confessed lifeist I would definitely pull the lever.
(By the way, the mediocre author is not actually on the track, but on a bridge on top of it, out of harm's way)