To add:

World investors have been searching for an investment that has zero potential for manipulation from oversupply.  Bitcoin is it.  Bitcoin is fixed at 21M, hence it can never be devalued from oversupply like fiat or commodities.  Gold is somewhat limited but not to the same degree and hopefully not with the same level of price manipulation.

Ideally, over time its limited supply will provide a stable platform for intrinsic value that other currencies measure up against.