I hope someone has a better answer. Remember all those small forums, wikis, and wordpress blogs with open comments? Some admins spent hours manually reverting

I hope someone has a better answer. Remember all those small forums, wikis, and wordpress blogs with open comments? Some admins spent hours manually reverting automated linkspam. Others didn't. The solution was to pay centralized services like google's recaptcha or disqus with the user's data. Mastodon is looking okay so far. But I don't think spammers are seriously targeting it yet.