And you're absolutely right that BTC is a big bet, but it's basically betting:

1. Central banks are too incompetent and uncoordinated to issue a global reserve currency that they don't end up printing away to nothing
2. Crypto remains a greasy pole and in the crypto-sphere BTC is impossible to dethrone
3. Gold remains stupid and annoying to move around, protect, or transact in

So basically it's betting against legacy institutions.

Also I personally agree with most of Saifdean Ammous's political message, but that's a personal conviction so YMMV...