I think you are right....several recent comment about futures contracts being a "zero sum game" struck me as odd/wrong.
About open interest I mean.

I realize that as RoB "Scotch Presbyterians" we are not supposed to do anything but "buy (index) and hold until relieved"...but perhaps they could run some articles clarifying this fascinating part of the market :):)
If only to help us understand the news we read.