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.
It largely just trains their AI, and a lot of people don't want to do that.
Also, a lot of captcha implementations have issues with content blockers and whatnot.