Depends on a few things. Instance admin can rate limit requests. Pretty easy to identify a bot that's scraping traffic.

That's also one thing I try not to worry about. I don't generally say anything online I wouldn't feel comfortable saying on a soapbox in town square (generalized anxiety disorder aside). As a nerdy 90s kid, I learned anything you put on the public internet is public domain unless stated otherwise, and will probably exist forever (if only I could remember any of my GeoCities addresses).

it's not like centralized services in any way prevent this, at best they can make it inconvenient but on the flipside you can be 100% certain they are themselves selling off all your data and doing so with your permission (you did real the TOS right?)