The few legit / non-speculative uses of crypto are denominated in pegged stable coins like USDC, USDT, and some lower volume options denominated in EUR and other currencies. You can deposit these into crypto banks for a ~3-8% APY. A few of these options are even FDIC insured (e.g. Gemini's GUSD).
(this is unrelated to Bitcoin, which is more or less a volatile meme asset)