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.
I believe you can literally just add a . To the end of your own gmail and it will go to yours. Ie hello.1@gmail.com will go to hello@gmail.com.
Actually, hello.1@gmail will go to hello1@gmail.
The one you are thinking I believe is hello+1@gmail will go to hello@gmail