Except that it's not legally valid in the U.S. or in Europe, where courts will not and cannot enforce a copyright which has not been registered with a recognized copyright authority (i.e., the U.S. copyright office or its equivalents in the European Union).

You are on the border line of committing fraud when you state that your are providing free copyright registration, because you are not. You are providing free third-party copyright registration, but that is not the same thing.

(IAAL, and I have done copyright litigation.)