Sad but understandable.
How many billions do you think the company missed out on on dota? After dota came HoN, then LoL, then Dota 2, and their answer after all that was HotS (which closed down their competetive scene). They never made a good moba early and missed their chance.
And it’s a good question - should this kind of copyright hoarding ever be applicable? If yes - at what level?