Bitcoins are analogous to gold; both gold and bitcoins are limited in total amount, making them an effective way to store money without paying the "inflation tax". However, there are currently many problems with cryptocurrencies, such as the division into "pure" and "dirty" crypto, and I am not sure that cryptocurrencies are more convenient to use than gold. And this leads to a new question: why the gold is not growing as fast as bitcoins? Maybe buying gold is illegal in the US/Europe?