Or, not quite at hyperinflation, but your government is enacting policies based on MMT or similar and you are worried that this could hurt you (as a holder of the currency) in the long-run.
Or, maybe you're worried about governments being able to dictate what you are allowed to purchase with "their" money.
Or, maybe you want to send your money somewhere your government doesn't want you to send it (or their government doesn't want the other party to get it).
Obviously there is a lot more to cryptocurrency than just "not being issued by a government" as well though. There is general privacy benefits (Monero) or the promise of innovation if you have programmable money / contracts (Ethereum).