I used to see Google as a stalker. How naive I was. There are billions of people being stalked, exploited, and the whole process is automated. It comes to me that users are not victims of stalking, they are lab rats.
Now Google stopped reading emails for ads, but they'll still read for other purposes, which still makes me as a user feel insecure. I value my privacy, I have my dignity, I shouldn't be a lab rat that they can just observe however they want only because they provide free cheese.
Even if I start using a paid account to stop them from reading my emails (assume paid account with better privacy protection is possible), I couldn't stop them from reading others'. Stopping the data collection of one user won't change the situation, they still have other lab rats' data they could collect and analyze, which enables them to learn or predict other rats' behaviors.
The worst thing is, Google is not the only company doing this right now. Surveillance technologies are developing, it's like every data company has grown their teeth and become more thirsty for blood.
Edit: words.