We did notice a large amount of bot sign-ups early on. We already ha email verification on and they never made it past that stage.
We have since turned on CAPTCHA and now they aren't signing up any longer.
We've purged the bot accounts from our database.
We are working on generating organic content but we've only been open for a couple weeks so I just ask that other instances bear with us. We've a very niche community of sci-fi and fantasy geeks. We'd love to be federated again.