

I don’t mind ads so much. What I don’t want in invasive tracking and collection of every scrap of data they can to push ads on you. Give some dumb ads based on the damned contents of the page and I would be fine. But no, ads is basically a synonym for tracking these days.

Afraid to tell you but Google already scans thousands emails if you use proton or not. The company you are sending mail to likely uses gmail internally. Does not matter how private your end is if the other end is wide open.
Though I am not convinced that anyone would care if you use a non gmail account for any technical role. Hell add a custom domain to proton and you can hide the fact you are using proton and create a even more professional looking address.