It is correct that they ask for advance payment and I'm not even sure that my art became real NFT as they are on Opensea. Can't see any metadata, etc. I also did not go for the request to send more $$ to create a PIN and link my wallet. Since I was doubtful early on, I did get them to send a small amount to my wallet to prove that they could without delay. But then they said it was a mistake. I'm sure I will never receive the earnings, but they still try to telegram and WhatsApp, so just block and report them.