Sorry mate, the banks use of derivatives were curtailed/stopped with the implementation of Dodd Frank which introduced regulations on many Bank things, one was the amount of physical copper a bank needs hold on its balance sheet to support some tricky stated copper positions, our interest would be copper derivatives- anything you could monetise from saying you held ownership of physical copper.
Trouble was the players could tell lots of porkies about how much physical copper backed your "paper" hence regulation, at the time Dodd Frank came in there was not to enough copper in the world to cover the paper written on copper
It was not as simple as saying with Dodd Frank they will (they will do that too) all agree and hold physical copper, they lost interest and that fed across to genuine legal paper which was supported by physical things, killed the activity too much some say. If regs do come off it will increase copper prices. Is he kidding refers to, will Trump do it, is he after it, refers to same thing i.e. will he actually unpick Dodd -Frank.
Trust it's clearer.
Cheers
Phil.