That's the wrong answer. The existence of tokens predates the existence of government. It's the next step after barter. The correct answer is reputation. A vendor who cheats his customers builds up a bad reputation, and the only way he can keep doing it is by changing customer bases, for example by moving to a different town. Think of the traveling snake oil salesman who moves on once people realize his remedies don't work.
I think if a true crypto economy does emerge anywhere it's likely to be Nigeria, Lebanon etc - places with a significant population of educated entrepreneurial people but where the state is run abysmally and you can't rely on those institutions anyway
The alternative to governments monopoly on violence for enforcement, no matter if you exchange in monero or giant stone discs, is broad use of vigilante violence.
So while crypto seems like an interesting technology for moving money around, it seems like it doesn’t solve for the point of exchange problem and thus crypto that focuses on making that difficult for government mediation are bound to be only useful for illegal activities.
What you actually have is the opposite problem (in a sense) - the transaction is irreversible, the seller will receive payment and keep it even if they shouldn't (i.e fraud). So there is more risk for the buyer than in a fiat system where transactions can be reversed by legal processes
You can dial the risk in either direction with any payment scheme (20% down balance due on delivery etc) but you can’t eliminate it.
A good example is how disputes work on P2P crypto exchanges like bisq - you have a crypto contract of some kind that holds funds in escrow, but ultimately disputes are resolved by a team of actual humans who look at the facts and make a decision, not everything can be "code is law"
It comes from stability. Predictability.
Courts and law enforcement certainly provide these things, but they are not required. The inherent design of blockchains makes them trustworthy (an oversimplified statement), which is even better.