Based on the above, I believe that Hhampuz has stolen the excess money from the BestMixer campaign for his own personal use.
That's quite a leap. You've offered no proof the funds have
not been returned BestMixer, or that that Hhampuz sent them to his own personal wallet. You don't know where the money ended up, and apparently that's by design. BestMixer hired to Hhampuz to escrow their funds, and even if he still has the funds in his possession, that's not a scam, he's doing what he was hired to do.
This whole thread is based on a lot of speculation and wishful thinking.
The money very clearly was moved, that cannot be disputed. I explained in the OP how I know Hhampuz did not receive instructions on how to return the money after he ended the campaign.
The theory that Hhampuz moved the money to his own hidden address unknown to anyone and therefore is not stealing is quite the leap. The action of moving the money through a mixer is evidence his intention is to keep the money for himself. There is no reason they would want him to do this.