A while back I had mentioned that a weird guy who bought one of my products, eventually hired somebody else to start making the same product for him (changed a tiny bit) based on my product... then emailed everybody in the niche he could think of to specifically brag about it being better than mine. I just noticed today that a customer was calling him out on a very large forum for the niche, claiming that he had been giving him the runaround and not sending his products he ordered... He claimed he had enough, and was going to do a charge-back and call the BBB. This list is seen by many many people in the niche.
Maybe I should send him an email and thank him for an early Christmas present.