You are forgetting that there isn't an incentive for any of the makers of my software to trick or coerce me into doing things I don't want to do. With the profit motive removed free software has less of an incentive to hurt me.
But if you think open-source gets rid of that issue, I'd like you to look up "Ubuntu Amazon search ads", maybe "systemd vs init", also "pulse audio" just to name a few. Yep, it's possible to get rid of all of these things, but again, only if the user knows how. Which again, isn't a common skill.