Board Thread:Support Requests - Community Management/@comment-36009152-20181003233723/@comment-26923519-20181008181120

If I remember correctly, I think it used to use captcha for registration. Now, it doesn't.

Also, here's an alternative solution: There should be a filter that restricts a user from creating a thread. If they want to create a new thread, they'll need to wait 5 minutes in order to do so.