I've just found kbin.social and find it has superior signup options. It's just: make an account (email/password), or sign up with Google or Apple. No server talk.
Actually, it is not a superior signup option*. /kbin simply has no other English-language server! (remaining three /kbin servers are Polish-speaking)
*Well, corporate logins being available as an option actually are an advantage - for not-deGoogled users.