[marginalia_nu]

Likely an IP reputation thing. If you are using a VPN or routing your network through a cloud IP or VPS, try not doing that. Also check your devices if they've been compromised. Maybe you're part of a botnet.

[emerongi]

Probably by this point my fingerprint is tainted. I appreciate the suggestions, thank you.

[firefax]

Have you been repeatedly banned anywhere? (Reddit, Facebook etc).

The only time I've seen someone have a "tainted fingerprint" was because they were a relentless incel troll who kept getting banned on reddit over and over.

(Not saying this is your case but... I've had people say interesting things on this site at times)

[marginalia_nu]

I used to run a search engine out of my living room, so I know the experience.

IP reputation is usually reset after a while assuming whatever got you flagged stops, so it's not necessarily permanent.