Are you really ignorant enough to think a black hat or scam affiliate really gives two rips about GPWA? Mediation would work for an honest affiliate that may have made a mistake but really the nasty affiliates that are ripping off the programs and players are not going to come forward here or any other reputable forum/organization.
The programs already talk among each other and can pass on information on "non trustworthy" affiliates. It is being done now, just wash your own laundry. We as reputable affiliates don't need to be involved in the process. Our time is to short as it is.
If the individual is rouge, get rid of them. Tell your fellow program managers so they can keep a keen eye. Naming and shaming is not going to help anyone and as TheGamblingGuru said... You better have some damn good insurance and legal staff. You are poking a stick in a hornets nest.
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"If you shoot for the stars and hit the moon, it's OK. But you've got to shoot for something. A lot of people don't even shoot." - Confucius