Banks and large investment firms are more than happy to create exotic instruments. With enough money at stake, you can definitely find an institution willing to take the other side of a bet against crypto (specifically BTC or ETH).
If you want proof, refer to what happened in the lead-up to the 2008 Sub-Prime Mortgage crisis (or check out the movie The Big Short if you want somewhere to begin).
If you want proof, refer to what happened in the lead-up to the 2008 Sub-Prime Mortgage crisis (or check out the movie The Big Short if you want somewhere to begin).