Bronson makes a good point about the unwillingness of people to expose the frauds. Unfortunately, this is too common. I think there are several reasons but a key one might be the unwillingness to accept the fact you've been duped. Especially, when you realize you've poured a lot of money down a rathole and have nothing legitimate to show for it other than some weak skills.
If anything, I hope this thread has raised awareness of the frauds that are out there and hopefully if you happen to be practicing with one that you start questioning whether you should continue. I think several good ideas have been presented that will let you assess the claims. That may be the most effective way to put them out of business. To quote DeNiro in "Meet the Fockers" we are are watchng you