Because the writing has been on the wall that people are no longer going to pay for operating systems. That means that MS has to replace all that Windows revenue with services revenue. Apple has already done this in that their services revenue now account for $100B annually (https://www.statista.com/chart/14629/apple-services-revenue/) and MS doesn't have a hardware business to rely on as Apple does.
I'm sure MS sees a future where Windows is free and if you don't have an account, they can't monetize you at all. At that point, you are no longer a customer so there isn't much point in them continuing to support you.
I'm sure MS sees a future where Windows is free and if you don't have an account, they can't monetize you at all. At that point, you are no longer a customer so there isn't much point in them continuing to support you.