This is, very literally, the old scam of selling a bill of goods. The mark has bought just a bill (list) of goods, not the goods themselves. The author appears

This is, very literally, the old scam of selling a bill of goods. The mark has bought just a bill (list) of goods, not the goods themselves. The author appears to be comparing it to a pyramid scheme because artists are being encouraged to buy other artists' NFTs, so earlier entrants into the scheme are being paid by more recent ones.