I don't know if you're referring to how it works where you live, but in regulated Europe you have to pass KYC
I'm talking about the same casinos and paid sites where multi-accounting can be beneficial and work on the Internet. Providing documents that are sold and bought in batches on carding forums will not play a big role, without the uniqueness of the user's system. Anti-fraud analyzes the characteristics of browser fingerprints and, even without registration, can understand whether this user has been on the site before or not.
Not a bad idea, but how would the system detect someone who accesses the forum using Tor browsers or a VPN that does not store a user's browsing log or history? How would the proposed system identify such people?
If you forbid the possibility of creating a certain number of alternative accounts, then the attitude towards their easy creation would change dramatically.
I talked about this recently in another thread:
there are somethings beyond the admin control and limiting the number of alt account is one of them, it would be difficult to detect someone creating multiple account from different IP addresses. its either having alt account is prohibited or nothing.