How much effort would it be for them to create a new one and do it again?

Minimal, but it is the domain that gets blocked so the attacker would still need to purchase a new domain.

Would you like the admins to permaban them?

We’re not opposed to hosting non-Star Trek communities as long as they adhere to instance guidelines, but before you move you should know that the federation gap with .world is closing and should be finally caught up before the end of the week.

Time for startrek.website/c/theymightbegiants?

Tesseract is great!