I don't see what's the big deal about this. You put out your words for the world to see. Somebody found something interesting to do with that.

For that matter, why do you think companies like Google and Meta give you stuff for free? Because they earn money from your content! Google inserted themselves absolutely everywhere to have the best possible idea of what you do, where you go, who you talk to, what you read, and from that figure out how to best advertise to you.

When you sign up for a free service whatever you upload to it is how you pay for that "free" account.