Mind you, most Windows home users haven’t paid for an operating system. Either because they’re pirating Windows (e.g. most of the Asian market) or because they’re using an OEM license that Microsoft sold basically at cost (after CapEx:OpEx conversion of R&D expense, ala pharma companies.)

The only profit “Windows” as a product makes, at this point, is 1. Whatever tie-in channel partnerships they can sneak in (like the Candy Crush ad in the start menu), and 2. The cross-department budget Windows gets from Azure as lead-gen revenue (given that Windows is gradually becoming ever more tightly integrated with the Azure SDK, such that it’s only natural to use Azure to build a backend for a Windows app.)