As I've pointed out before, the Winkelvoss ETF is a dump. They bought a lot of Bitcoins, and now they want to cash out. If they sold them on an exchange, the price would crash. The ETF is an attempt to get rid of those Bitcoins without crashing the price.
Wishful thinking never ends on here.
So? Greed is what drive Bitcoin. I would be suspicious if their motives were anything else.