So stock, property are not man-made? Why do you think something has no value because it's man-made? Cash is also man-made.

Holding BTC has only one risk, that is suddenly everyone throw it away and think it is valueless, which I've said only will happen when something much better replaces it. Otherwise, it is much safer than any other investment.

Buying property, you are betting on the politics, economy, security, and many other things on the location of your property. You have to worry about the earthquake, fire, flood, storm, hurricane, or typhoon.

Buying stock, you are betting on the market, competitors, the leadership of the CEO, and many others. Moreover, you have to worry about insider-trading and fraud in accounting.

Buying gold or silver, you have to find a safe place to store them and then you need to find a safe place to sell if you want cash.

I believe now you will agree with me why I said investing on BTC is the safest and the easiest.

That said, I'm not saying it is risk-free. It is highly risky, but investing on anything is risky, and holding fiat without investing is even more risky.