Crypto is another form of fiat. Hell, gold only really has monetary value due to proclamation (I get there are jewelry uses and electronic uses for it). If we didn't agree that gold represented "wealth," it'd be essentially worthless. In a economic collapse, that proclamation won't matter much and gold will just be a useless object. The thing to invest in is yourself. Even after economic collapse, people are going to need tools repaired/made. People are going to need food and alcohol and other things. If you can provide those things with your labor then you have something of value to trade in a collapse.