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A long time ago ... I recall certain sites and services (like a MUD I tried to join) would not allow you to make an account if you were from AOL. I forget if it was just by email address or if they actually checked the IP address.

Would love a reputation service that correlates IPs and/or email addresses to the amount time users spend on Facebook. I'm sure this data is out there and purchaseable, to be honest.

Are there any forums with "long-winded discussions" that exist in Tor only, other than kiwifarms?

Yes.

If you have forums that haven't been raided by trolls and idiots, it's because they have a good moderation system in place.

That includes being selective about who you allow to have an account.