Please. Captcha by default. Email domain filters. Auto-block federation from servers that don't respect. By default. Urgent.
And yes, to refute some comments, this publication is being upvoted by bots. A single computer was needed, not "thousands of dollars" spent.
Then I, as an admin, can defederate/block that server. It's not a hard problem to solve.
My instance does not have bots. So demanding I do something is asinine.