It's conceptually difficult for me to understand how anonymised data can be useful in any way.

There's probably, like, a particular way I move the mouse from the bottom left to the top right corner of my screen. A 'mouse cursor gait', if you will.

To be frank though, there doesn't need to be a reason. You're treating this as a Stockholm-syndrome esque situation - I don't need to use Windows, I definitely don't need to justify why I don't like certain aspects of it.