Any established player that doesn't defend its position will be quickly unseated. I'm not saying this is an appropriate way to defend itself, but it's certainly one way.
Sure. But left unchecked it results in Microsoft's "extend, embrace, extinguish" 1990s.
Maybe, but I kind of feel like the difference between making your competitor's employees a better offer and deliberately exploiting a monopoly to destroy any technology you don't control is more than just a matter of scale.