I have made a post about this before, and tried to find a solution but the problem has just become worse and worse over time. Our website is being over run with daily spam registrations who come on and post new threads of spam & post spam on forum pages too.
Today I added a security question related to our YouTube channel, so hopefully that helps.
IS there a way to instantly ban anyone who registers and within 1 day starts a new thread with a link in it. Or even not ban, but just disable the account for ADMIN moderation. It is getting beyond a joke, all our moderators are complaining because every day they are having to delete thread after thread of new spam.