The cause of sports piracy and all of these weird deals is because games are most valuable in the regions of the participating teams. It's a Gordian Knot of rights issues, and it exists as a way to extract as much money from fans as possible.

And the teams want it this way -- both the Leafs and Canadiens are tied into telco/cableco ownership, who has a vested interest in getting you to pay more for games.