I'm glad Jamie Dimon got reported, but I think you are all looking at this wrong...
JPM trades on behalf of their customers... they aren't stupid enough to publicly manipulate the market and then buy a derivative of that market in order to profit. I think we both know the fines, PR nightmare, & court fees would easily dwarf any profits they've gained from doing so.
It's not market manipulation to have an opinion about something. We see it happen with short sellers all the time, they will put in a giant position and then annouce they have a giant position and "this is why" causing everyone else to freak out when they realize the pretty picture painted by others has some cracks in it. We've seen that with Enron, Herbalife, Soros and the GBP, John Paulson & the housing crisis, etc etc etc. All of these positions were publicly known & spoken about BEFORE they were ever profitable, and all of them used publicly available information so anyone with the ability to interpret that information could've done the same thing.
It's much more likely they were buying XBT derivatives ON BEHALF OF THEIR OWN CUSTOMERS.
This narrative that they bought on their corporate books is speculation at best until it can be proven otherwise... continuing it only makes Bitcoiners look dumb as fuck for not having even the slightest idea how a true investment bank functions.
Please stop mindlessly regurgitating things you've read and do a bit of research for gods sake.