Why? They could roll out W12 with subscription-only plans. Besides the contracts they currently have that specify a specific amount of security updates for X years, they can let W11 and previous versions die. No more updates besides what they need to protect themselves.

It's not like governments and businesses will balk. They already pay a premium for Windows licenses and they'd probably get deals, anyways. Average home users might not upgrade, but all new PCs sold will have W12 and require a subscription if you want to be able to use most of the features.

This is what happens by not breaking up MS more or imposing penalties for anti-competitive behavior.