[kombookcha]

If there was no easy way to exchange large amounts of FIAT for crypto and vice versa (other than peer trading with a person), that would effectively make crypto like any other form of tradeable unofficial currency. Gold bars or diamonds or krugerrand. Insofar as crypto is "just" digital cash, it'd still work just fine, but it would make it trickier to move large sums around for criminal enterprises - much like how you'd need to jump through laundering hoops to translate your suitcase of undocumented diamonds back into FIAT, if you didn't have a reasonable answer for how you came to have them.

It'd also put a dent in crypto as a perennial pump-and-dump investment scheme, which in the long run would probably be quite good for its ability to actually work for daily, legitimate use.