The ProShares Bitcoin Strategy ETF is on track to reach a limit on the number of futures contracts it’s allowed after quickly becoming a little too popular. After just a couple of days of trading, the ProShares ETF has reached 1,900 contracts sold for October and there is 2,000 front-month limit imposed by the Chicago Mercantile Exchange. There are already 1,400 contracts for November and there is an overall maximum limit of 5,000 open contracts according to Bloomberg. One solution could be t...