It would help to see something about a privacy policy. Letting a 3rd party into your inbox is like letting them into your home.
Fwiw, Privacy is a point of differentiation. It's a feature where you can say "Our product is better...Better experience. And your digital colon isn't probed on the regular..."
Personally, I'm trying the best I can to not go back to email that doesn't respect privacy. There may not be many of me, but I'm not alone.
Privacy is the new black.