>Myself, I wanted a Nest up until google bought them... no way I'm giving them sensors in my home.
Do you have a smartphone that has anything made by Google installed on it? If so, they already have lots of sensors in your home. Some of which they haven't tapped into yet, some they have.
If not, do you ever use any of their services from home? What about all the sites that use Google Analytics? Even with just that, they know where you live and could easily compile a set of times you're at home, which is just about the only thing that Nest data gives them. (I personally don't view the humidity at my home that revealing, privacy-wise.)
I want to stress that I'm not trying to antagonize you or belittle your stance- I feel privacy is very important, and it makes me happy when others feel the same. I'm just trying to show you that unless you've taken (what some would say) extraordinary measures, Google already knows more about you than what Nest is going to give them.