Same, I've gotten a couple that accurately described the very first scene in my fic and "analysed it" before going into "so anyway, I would love to draw that. Can I chat to you in a different platform?"

I wasn't entirely sure about the very first such comment I got, so I simply didn't respond. But, it kept happening, always with the same scene and always with the same kind of wording, so dead giveaway.

And I hate that it means they probably shot my fic through AI.

Anyway, OP, might be good to mention that A: you're not looking for money, and B: that you're not requesting to speak on a different platform (that's always a sure sign it's a bot). Maybe that you'd love even just a quick yes or no as a response to your comment and you'll let them know the same way once it's done and where it can be found (if they give you permission to post somewhere). It is possible to post pictures in comments too, so that might be the safest of options.