

because microsoft is shifting focus from selling you a product, to selling you as a product
And they need a unique account to track every single click and thing you do on your PC, and the web, and everywhere else to facilitate doing that with greater control and ease.
Its literally what, and for the same reason, google has done for the past decade+
Republicans would be very upset with you using the bible against them, if they had ever read the bible to know what it said.