Hello !
I looked at the chain, which is shown as a proof of payment, see that it is in the third degree here's the address.
https://blockchain.info/address/19owPa429227sLrUVeiDrZfw97G4eaZUj4Judging by the operations at this address, I only see that any amount incoming to this address immediately goes to the withdrawal. I think they only accept bitcoins, but I did not notice payments that would have doubled at least some amount.
Or am I wrong?
Thanks for your analysis, I think you're right.