Crypto doesn't have to be like that. I agree it isn't a controlled currency. That was by design, but it is why it swings so wildly. I'm unconvinced it will ever stabilize. A country/trade-block will want to have ways to control the value to stabilize it.
As for funny money, well, money is just units of value that people agree the value of. It's all just belief based. Even if it is gold backed, which I don't think any are now today. If Musk found a massive gold asteroid, the value of gold would drop as he brought it to Earth. Even if there isn't really a gold asteroid. Just mass believing there is, reduces the value of gold. Everything's value is from our believe of it's use, scarcity and what we think everyone else value for it is. It's all funny money really!