Google had been receiving shit from people for violating privacy since they had the novel idea to release a free email service that scanned your emails to deliver you targeted ads. The consequent centralization of email (ISP provided email pretty much died after) was subsequently used to allow the NSA to scan a huge amount of peoples personal information.

I think in the last few years is when things tipped to me distrusting Google more than the boogeyman of older times - Microsoft.