You need either a graphics processing unit (GPU) or an application-specific integrated circuit (ASIC) in order to set up a mining rig. Most people use these tactics to buy Bitcoin in Ottawa.
Scammers are the bad element of the society. They scam with the innocent people and by this they are not going to trust anymore. I think the only solution is that the channel creator have take a look and kick out all those who scam with other members.