An interesting new one for Canadians (that's built on AT and interops with bsky) is https://gandersocial.ca/. It uses our national postal service's identity validation, so it dramatically reduces foreign actors and bots, and without handing PII to shady private companies like Persona. They collect no PII either, they just get an "is_a_human" response back from Canada Post.

You can still do read-only things like see threads and follow users as an anonymous user. Just can't post or comment. Only thing I don't like is that it's app-only for now.