People just LOOVE to be outraged. For example in this thread people rage about google getting hands on their data. When I point out that the webmaster has to explicitly chose to share the data with google, I get downvoted. When I say that GA prohibits the use of PII, I get downvoted. It doesn't matter that I'm right. People WANT to be outraged. Reason, no reason, doesn't matter.
If software compromises my privacy, I feel that I have been betrayed and lost something that I can not take back.
If you don't get to automatically participate in a "anonymous" usage survey, have you lost something you can not undo?
That in my opinion, is why software should always err on the side of privacy.