Id just be really uncomfortable with google monitoring, recording and analyzing my personal communications to sell me ads or worse later. Everything google does now feels.... invasive for lack of a better word. This is something Id like to see from Apple, and Im not an Apple fan at all.
I do not trust what comes out of Google PR vs what their engineers do behind the scenes. They've been caught in the past doing nefarious things or just a general disconnect/interpretation between what they say and what they do. Because they are an advertising company I always assume that takes priority with direction.
