Oh, I mean, the "why" is pretty simple. They're going to enable onedrive upload by default, wait until the sync finishes, then change the EULA to allow them to scrape everyone's onedrive for machine learning data that they can then sell.
I can't tell you the last time I read a EULA. Probably back when software still came in a box and they put the EULA in said box, and I was stuck on the toilet without any other reading materials.
>>Welcome to hell.