Earlier quoted context omitted.
When push came to shove, pretty much all money (and assets) dropped hard in value vs stuff that is critically needed. Hardness of money is really only situational. Really hard money does not exist that is why things like productive assets are where wealth goes - not into other non-productive monies. For example, equity is already used as money at times (M&A, salaries).
Bitcoin is a productive asset. I buy it, lend it to a business who can use it as collateral and I get paid back more bitcoin than I lent them, as compensation (i.e. interest)
Only if you're given permission. It's not natively productive like Ethereum.