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Incidentally, SO just released a blog post about their spam prevention measures. https://stackoverflow.blog/2020/06/25/how-does-spam-protection-work-on-stack-e

• lucb1e 6y ago
  Oh cool, that explains why we see so little spam. Still though, Wikipedia is also a big site with a huge audience, they must have similar issues and perhaps protections. Assuming there's more to it than just IP bans, the same could be applied to Tor plus a review queue to make non-spam vandalism also unattractive.