Yes, sure, I know a lot of people who're not comfortable with sharing everything with Google, and I can understand that. Unfortunately, most of them are sharing

Yes, sure, I know a lot of people who're not comfortable with sharing everything with Google, and I can understand that. Unfortunately, most of them are sharing their private data with some third party if not Google (that won't be any more careful about their privacy if they could mine the data as Google can, and probably technically less capable of preventing external breaches). In the end, it comes down to trust, one 3rd party or the other - as they're not managing everything themselves.