Maybe there isn't one.

This is what I'm talking about: people think monopoly = bad, so if I say Valve has a monopoly, I must want them burned to the ground. Nah. They're mostly fine. Having only one good option is precarious, but it is still a good option. For now.

But they're still a monopoly. We should say so, because it's true, and important. It shapes the entire PC gaming market.