It's interesting that this is coming at a time when the adoption amongst developers of the Universal Windows Platform (UWP) is in doubt. UWP is a new method of packaging Apps for Windows, which work on all variants of Windows 10 (desktop, laptop, tablet) and can only be installed through the Windows Store. It's hitting a dead end as developers can't sell their UWP games on Steam, they only work on Windows 10, and the Windows Store as is has been a colossal failure.
I wouldn't consider it outlandish that the Windows Store version of Call of Duty: Infinite Warfare had separate multiplayer servers from the Steam version was due to Microsoft's interference. Either they demanded they have separate servers to try and take on Steam, or there is incompatibility between versions at a network protocol level.
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