A simple way to filter out bogus accounts is to require KYC. If an account has been verified, they have greater posting abilities. If they haven't been verified, they are in read only. This seems like it would weed out bots and spammers!
I would be willing to do KYC to keep my account!
If you knew what I have gone through as a scam buster with my identity known, you would realize this is a bad idea. :/