If Microsoft had been smarter they would have leveraged their OS monopoly to position themselves to become the game launcher monopoly on the most used OS in the world, and been the go to place for every publisher. Would have made it easier to push UWP and added in additional DRM to make it more difficult to make Linux gaming a possibility with the game launcher being one run by Microsoft and made it more baked in to be reliant on the OS like Microsoft Store.

And even if game compatibility was worked out for Linux made it so people would need a Microsoft account if they wanted to play most PC games. That's what Microsoft lost out on letting a non Microsoft company gain success with a third party launcher that is now leveraging their success to push a non Microsoft OS to the mainstream.

And about anti competition. All you've said is something about cuts and I pointed out that it would actually hurt competition, so you want them to make cuts so other launchers lose one of their selling points while making those that need a higher cut like GOG harder to stay alive as a business? I think you should get mad at other corporations for not also getting into the PC gaming market sooner.

You can complain about them making a lot of money, but other than that you haven't really been clear beyond the generic they make a lot of money and are a monopoly euphemisms.