Are you familiar with Ponzi scheme? It is a form of scam wherein a certain company attracts investors by promising return of investments. But the truth is they give returns to old investors from the money that the new investors put in. So there is really no profit-generation going on. Then in the end, they stop giving returns and announce that the company has closed down and they have taken their investors' funds.
So, although I don't want to believe it, is it possible that this is what's happening with Bitcoin or any other crypto? Can anyone enlighten me again how profit is generated in crypto?