They actually need to provide proof, and though they have solve some of the cases, that would not give them a good reputation as solving cases should not be selective, it should be for all cases or problem which I doubt they can solve everything.
Lol they have mentioned many times before if you only Surf back this thread that they Have the rights to reserve their secrecy about the Proof from what they are accusing to those banned accounts.
Meaning for any reason they need nothing to explain here and that is the actual attitude of scammers.
So be aware and Try to avoid this site.