Of course it is easy lol
You choose what Store to sell your game... you can choose WS, Steam, Origin, etc... that won't change.
If MS want their own games on WS exclusive it is fine like Valve games will be exclusives to Steam.
If a dev wants to make a exclusive deal with MS and WS it is fine too... the deal can be good for the devs.
Sorry but people are overrating for nothing... devs are open to choose what they thing is better for them.
this isn't really about consumers, honestly. It's not about which storefront to use. It's about defacto standards.
The push these last few years to get developers over to Linux, it's been fascinating as an actual developer. Seeing valve's presentation on their solutions and what precisely the problem facing linux development is. The end consumers really miss what the conflict is all about. Many of microsoft's development products including direct X, and their visual studio IDE and debugger, have become defacto industry standards at the expense of atrophy of their competition. Given their weight in the computer industry, it becomes destructive when they push proprietary products so heavily.
These last several years, for the first time in a good decade, a lot of alternatives have been propped up and given a serious jolt. Everybody uses DirectX because OpenGL extended by SDL was significantly different and outdated. Now we have SDL 2.0 and Vulkan.
All this ties into microsoft's philosophy of embrace, extend, extinguish.