It's crypto, no one knows who bought what. It's an open wild west market, gambling similar to poly market or baseball cards or such.
It's stupid, and stupid people lost money while the president made billions. Think Sam Bankman-Fried without the fraud and financial crimes.
If you want to be mad about Trump making money fine, but there isn't anything illegal, corrupt or untoward about it.
Trump would be in the capitalist hall of fame.