Microsoft's in-house
Azure Linux operating system used within Azure and for WSL and other purposes is reportedly pursuing an overhaul where it would be derived from Fedora Linux.
Azure Linux -- originally known as
CBL-Mariner -- is already an RPM-based Linux distribution that is catering to the various Linux needs at Microsoft. It's scope and capabilities of Azure Linux have grown a lot the past few years and now it may evolve into being derived from Fedora.
With the recent
proposal to build x86_64-v3 packages for Fedora 45, it turns out Microsoft is involved in backing this change proposal. Kyle Gospodnetich as one of the change proposal authors for x86_64-v3 packages with Fedora 45 happens to be a Microsoft Linux engineer.