No company would be THAT stupid, not even Bethesda/Actiblizzion would stoop so low as to break the law in most countries just to spite a competitor. Their "fanbase" on the other hand.... yeah...
Honestly Blizzard has one of the most vile fanbases I've ever seen to date. No matter what happens it's someone else's fault, not the devs who made the changes. Granted not all are that bad, but the extremely vocal minority are the problem.