Trust is not binary. I trust Microsoft not to, say, deliberately weaken Bitlocker. I trust them to generally keep me safe and not turn on my webcam and watch me at night.

It does not mean I trust them building up a profile on me. Someone in this thread said Cortana pops up coupon offers when visiting Dell.com? I do not trust this to not be abused.

It is also about the overton window and shifting people's acceptance of spying, even in innocent forms like crash metrics. I've defended telemetry and used to turn it on for most machines, because it was optional. Making it mandatory is the wrong policy.