OEM license revenue represents a tiny tiny bit of their financials these days. They could just charge nothing for it and business wise no one probably notice much of a difference.
It is foundational to a lot of what they do, but older devices are just as good for their subscription and tie in revenue. Hell I use my work subscription for office from Linux, complete with OneDrive filesystem synchronization. Microsoft gets all their money from my headcount even as I don't even use Windows.
But that capex could bite them hard if revenue falls to follow from it. That's pretty much the only exposure investors care about.