Let us all bury fiat money then. What is fiat money after all? It is nothing more than just a piece of worthless paper. Or perhaps let us also bury gold and silver? What is gold or silver? They are just tiny stones mined from muddy mountains or under dirt. You know what, everything that has value in this mad world is agreed upon. Your bills and coins will give you food to eat, a car to drive, and a home to shelter you. But what is that really? They are simply human creations out worthless materials that began to acquire value because everybody agreed to.
Value is something that has practical utility, be it: legal claim that grants rights to tangible goods and services or tangible goods and services. Numbers on the internet are no such things. Crypto is neither a legal claim nor something tangible. It's just an empty number, a numerical value. If you give your iPhone to someone and as a result some number has been modified this won't make this number practically useful. If no legally enforceable claim exists that is represented with this number, than this is the same as throwing away your iPhone.
So you keep talking about legality, I take it cryptos aren't legal where you are at. In the U.S., where the dollar is used/made, cryptos are legal. So, just like a bank note, the law does allow for the trade of cryptocurrency for goods and services. People are getting paid in Bitcoin, you can trade/buy things with cryptocurrencies at/from U.S. companies. So, just like the fiat world, cryptocurrencies are being used as currencies. It's just that the ledger is on an open source blockchain instead of being behind closed doors of the banks. Get more educated on what cryptocurrencies are and how they're used instead of putting fud out there. Why are you here otherwise?