like e.g. universtity students needing to run programs which don't run on windows natively all the time, so many try out native Linux distros, some stay. Now all of them can just use WSL. Or like devs which need to develop for Linux servers etc.
Basically they have accepted that windows server have failed and their server license business model isn't that good anymore too due to how the cloud changed things. So instead of pushing for a Windows everywhere ecosystem they now embrace Linux on servers (preferable on Azure ;) ) and Windows on the desktop using WSL to bridge the dev experience and also bridge to university student use case.
But you can be sure that if they see a way to make it harder to install Linux on systems and get away with it both legal wise and PR wise (probably using some excuses about "security") you can be sure they will do so. Especially if they can push the blame onto others (like the hardware vendors not implementing some option in the BIOS which is needed to allow other OSes to be installed). Through at least for now I expect them to act careful to not damage their new image.
Also one way the failed the "Windows desktop" thing is by producing a pretty bad out of the box desktop experience for many people (like I'm fine paying for an OS but not if there is even a single AD in there, or bloat ware). This create reasons for people to switch to Linux which had been much less common during windows 7 days.