Cryptocurrency greatly limits the need for banks. Banks may still have a role in a post-fiat society, by offering full reserve loans backed by law enforcement should a person default, so their assets can be repo'd, but beyond that, banks would be pretty antiquated in a world that has competing price-stable, decentralized cryptos.

The "legal to illegal bridge" remark bugs me. He has a point, but he's basically implying that we should be enslaved to fiat, for all its flaws, effectively.

Eventually fiat will be used to determine who can buy or sell, with social credit system integration, a la the "beast system". Decentralized crypto offers an alternative to that kind of hell.

A cryptocurrency that flexed its new coin supply in tandem with adoption, and reduced new coin supply in correlation with Moore's law, would absorb volatility a lot better than something like Bitcoin. Like, if adoption increased 1%, the supply would increase 1%, so tangible good prices denoted in that crypto would remain stable, even if the fiat prices fluctuated.

2 factor authentication is a must these days. Don't put all your security on your SIM. Anyone who knows your number and is enough of a social engineer can just clone your SIM and get your coins.

It's still important to pay taxes, but there's no way to make a decentralized crypto accountable to government without know your customer compliance by exchanges.

Big business hides their money from taxation by buying up assets in credit and spending their cashflow on more assets, so a person can have a net worth of millions with zero taxable wealth. This happens all the time, it's how the 1% safeguards their wealth.