Not looking to argue with you as it seems like you have an idea stuck to your mind. But bitcoin/crypto is very useful to tax evasion, capital flight, criminal organizations, scams, speculative trading, wealth transfer, and other stuff.
There are plenty of people who use fiat currencies that are almost useless outside of their own nations borders, with extremely bad exchange rates. This basically binds a person to one country and hinders movement and prosperity.
Look at what the OP was saying, he was only listing negative things and attributing them all to something BTC excels at. I was saying that fiat is hardly a paragon of virtue :)
Some of these are trillion dollar markets.