What you are missing is that they created money out of nowhere. No individual loses directly, but it affects the overall money supply. In this case, the price of bitcoin was inflated artificially by buying it with an asset that was created out of nowhere.

It's like having a printing press that creates legitimate money. No individual loses, but the prices of everything you can buy will artificially increase (or another way to look at that is the currency deflates) if you print enough of it.