70% is not the end of the world for a single company stock. Plenty have done similar and come out on top (Apple, Meta, Carvana, Netflix, etc.).
BTC market cap is lower than nVidia, Apple or MS. But that is not important, what it should really be compared to is gold and compared to that it is an upstart at current price levels.
BTC has no utility other than being digital gold. Other crypto currencies have no utility either.