Derivatives are always a bad idea for the price of anything. If you decide to buy a futures contract of Bitcoin instead, you are not actually buying a single BTC, you are just betting on the price going up or down without actually buying it. It doesn’t take a genius to figure out what that does to the price of the underlying asset.
Derivatives are a 100% inevitability in any market worth bothering with. A market without them won't be taken seriously. If there was nothing in place by this stage of crypto's life it would a signal of something properly weird going on.
And since Bakkt is settling in BTC real Bitcoin certainly is on the line and changing hands.