I agree with you that the basis of the cryptocurrency market is manipulation. The trend of prices on all the exchanges specify trading bots. We don't even know if they actually have that many coins to bet on or if it's just the numbers we see. The main volume of sales of crypto is done outside the exchanges. But I'm not sure that bitcoin is a Ponzi scheme. I believe in the future of bitcoin but after the opportunity to buy and sell it for dollars, it became subject to those who have a lot of dollars. They dictate prices and easily manipulate the market.