The USD and Euro are managed by central banks much better at monetary policy than random rich people trying to manipulate an asset market (like those for cryptocurrencies) because they have an untreated gambling addiction. The idea that US Dollars are less stable and reliable in terms of price trends over the long term than cryptocurrencies is just ridiculous. Small amounts of inflation is good for the economy. It incentivizes people to put their money stashes back into productive use, instead of just keeping it sealed in a box.