You have CBOE offering futures on it. The prez of JPMC pro bitcoin. You have so many exchanges.
This ain't the era of mtgox, $10m pizzas and running your own full bitcoin node and joining a mining pool.
Bitcoin is out of it's infancy.
Jamie Dimon, CEO of JP Morgan, famously called Bitcoin "a fraud" that "won't end well" and is "worse than tulip bulbs."
You must be thinking of something/someone else?
https://www.bloomberg.com/news/articles/2017-09-12/jpmorgan-...
The futures are a nice touch, but they are cash settled so they will drift from spot.
We still do not have a spot market with swaps from companies you can trust.
Due to this, negative exposure is still difficult to replicate, hence why some brokers will not offer short side on the futures.