if you’re the only person on the planet, what do you own?

everything.

and nothing.

ownership is inherently social. 

it isn’t about having things, it’s the agreement that you do. 

and people still think crypto is about money?

The dollar has value only because we 'trust' that a country appreciates that value. If nobody trusts in the governing powers, then that dollar loses its appreciation. If there was 0 countries then we have no way of viewing currency as viable and we would just be trading stuff whose value is determined individualistically