I can see cryptocurrency as a replacement for legal-tender currency (issued by countries) in the long term, especially, when and if, it becomes more directly acceptable for any trade....world-wide.
But it appears most are buying, not for that purpose, but because they believe it's a good investment.
Imo...There isn't anything tangible in this investment and has become a gambling game for techies without the casino/bank taking its cut.
IMO...cryptocurrency doesn't have intrinsic value to grow, except for the expectation of profit. It therefore is a zero-sum game.....for any winner there must be a loser....QED.
I've been investing (stocks & property) since I had any money, which came late in my life (I worked over 20 years for the Queen on a lousy salary) and find the only way to properly measure the realistic value of an investment is to
sell, then subtract the original cost, then pay all fees and taxes, then apply any inflation/exchange cost.....and find the realistic profit and/or loss.
Same as Warren Buffet....except he started before me....
and was better at it.