The only money earned is off the back of people who join the game late, just like any penny stock scam. The early adopters get people excited about the "value" of cryptocurrency, accumulate massive quantities of coins, then dump the coin at peak value, causing massive plummets in the price, which inherently causes the newcomers to transfer their money from their pocket to the original investors (scammers) pocket. Yes, I realize any physical item has value because we say it does, but someone had to actually provide a physical object in exchange for your money, unlike cryptocurrencies which only consume electricity and do not do anything useful. They don't look good, perform well, or think anything. If cryptocurrency did something, such as perform scientific calculations, provide network infrastructure, et cetera, it'd all be good with me. Unfortunately, it's an endless loop with no substance to it. I understand people will defend it because its money to them which can put food on the table, which I would do if I were in their position, but as an outsider looking in, the way that major cryptocurrencies are currently implemented is not sustainable.