[OrpheanBeholder]

> (a) Previously unknown TOR endpoints get found out because they invariably are the source of vandalism and/or spam.

The English Wikipedia uses the MediaWiki TorBlock extension to automatically block Tor exits from editing, it has since June 2008, and before then they were mostly all automatically blocked by various bots so I don't understand how vandalism would be happening from them. Also, the Tor Project publishes a DNSBL and makes relays with the exit flag available through the ONIONOO API (which TorBlock uses). There are no "unknown endpoints", they are all publicly known.

> I have never seen a good edit from a TOR endpoint. Ever.

This is likely true since they are all automatically blocked before they can edit.

> (c) I have never seen accounts created via TOR or that edited through TOR that weren't demonstrably block evasion, vandalism or (most often) spamming.

You can't create accounts via Tor or edit while logged in via Tor -- not even Administrators can (although I think you can get a special exemption by jumping through enough hoops).