By nature, the fediverse is hard to tie back to individuals… But if they’re looking for you individually, they can find you
Yeah. Bonus points if your instance isn't hosted in the US. I'm pretty sure mine is hosted in Canada, and with the way it's going currently in a year or two Canada wouldn't be willing to piss on the US government if it was on fire much less hand over a server full of IP addresses.
I used to be into HP fanfiction and my god I got so tired of hearing about HPMOR. I didn't hate it, I didn't feel nearly that strongly. I got a handful of chapters in and put it down, but that's reasonably normal for me. But my god you could not escape that fic. It's fans were rabid and it's detractors were even worse than that. If it could vaguely fit a req, they'd bring it up. And then get three replies about how it doesn't fit the req and it's the worst thing since My Immortal within fifteen minutes.