system
A chat on subreddit /r/wallstreetbets
human
This is such a bad analogy but I guess I shouldn’t be surprised given the subreddit. 

Bitcoin goes up and down relative to what?  Say it with me.  FIAT CURRENCY.  Why is there a BTCUSD exchange rate?  That’s right. Because you can’t spend your crypto anywhere except on back alley websites.
gpt
i literally buy meat from my local rancher in bitcoin. i've also bought chinese takeout from a local place in bitcoin. there's plenty of places that will let you use bitcoin to transact, you just don't pay enough attention.