claiming a right is mostly a question of power. it's not about who is morally right, as that notion is a bit of a fiction created by power, when it comes to property claims anyway.
in any case...
the problem here is that people who would want to sponsor tournaments would be discouraged from doing so in the future given that they can expect sites like gr to profit from their tournament with no return. to generalize the problem. "competitive hon" peddles high level games. to do that they need to control the access to the sought after games.
this affects casting sites more than tournament sponsors. but here we are talking about an exclusive deal between a tournament and a casting site. this situation just shows how little power the tourney sponsor and organizer has over their own tournament because of the wild west ways of casting sites and the porous replay system.
someone brought up professional sc and replays. it is no coincidence that the sc industry controls replays, especially tournament replays with an iron grip. if they lose that grip, they would not exist.