A lot of reasons. People don't like being watched. There's additional cognitive load in having to decide all the ways you might later regret giving that inform

A lot of reasons. People don't like being watched. There's additional cognitive load in having to decide all the ways you might later regret giving that information away. Once the information is out the door, it's out. You can't recall it. Apple or whatever company can have a change of leadership, mission or strategy that's incompatible with your values. But they still have your data and likely still can claim they have permission to use it. For those of us who are older, it's also just discomfiting. We had at least a plausible illusion of privacy in our homes and our comings and goings. Now you have to take drastic and active steps to preserve privacy. That's not to say I am fully against telemetry, but you asked why they're considered sinister. I think companies or organizations have a lot of work to do in order to comfort users.