I would trust Ubuntu not to push down damaging updates that it would be impossible for them to do without it being discoverable. I would not trust them to hold

I would trust Ubuntu not to push down damaging updates that it would be impossible for them to do without it being discoverable. I would not trust them to hold on to my personal data with no way of knowing what they are going to do with it. "You do trust us" is a classic false dichotomy fallacy.