Total junk.. the whole idea of Bitcoin was the ability to get away from a government inflated currency.... My deal is if I have any cash sitting around I transfer it into brokerage account and put it into SLV or GLD.. nowadays you can do that in 5 minutes by creating an account with one of the Brokers that donchargerge any fees
Let's you exit out of trades into a stable "currency". Most exchanges don't do crypto trades against the dollar but rather do so against another crypto. The stable coin of choice has been Tether, but they're a bit sketchy about the funds backing that coin.