I'm an admin of https://sffa.community. (posting from my kbin since when I posted from my admin account it didn't show up here).
We did notice the bot influx. We had email verification on so none got past that stage. We have since turned on CAPTCHA and have purged the bots from our database.
We only opened officially a couple weeks ago so we're still working on organic content. We'd love to be federated again. Feel free to reach out if you need me to prove my admin-ship.