Privacy is a concern but not the primary concern. Google is too big to be in your life. If you use Google it's in everything. If Google ever kicks you out your life is going to be very difficult while you rebuild your entire digital profile. Google's too much of a risk.

Not to mention Google is demonstrated they will kill services at the drop of a hat. So relying on them is asking for trouble.

Google heavily uses algorithms to identify accounts to delete or block or ban. And this goes back to if your entire digital life is tied to Google and they do block you, you have no recourse. Google doesn't talk to humans for reconsideration. You're just out of luck.

Google is too much of a risk for a stable life