Ability to ban or delete users

Currently, anyone at anytime can make an account in the Discussions section, and spam the hell out of it. There is no way to prevent this, or stop the spammer from continuing.

CAPTCHAs are not a solution, as that does not prevent human driven spam, and the bad actor can do this every day, forever.

I'm puzzled how this is not a feature of a public discussion forum. Please make this a thing.