I have no Google/Microsoft/iCloud account, ProtonMail has been covering my (pretty basic) email needs for well over three years now, and now I'm leaving them.
Proton has been talking about adding calendar for years (unreleased), then they started working on ProtonDrive (unreleased), now they talk about an office suite... Then then flirted with the idea of doing an ICO to fund themselves, at which point I decided to leave. I don't want to be in a ship that sails in circles and doesn't have a clear direction.
ProtonMail free has 500MB, no IMAP, and max of 3 folders and 150 emails a day, versus Google's free, familiar, full-featured set of well-integrated services. Will they convince the average Google user to leave productivity behind, and pay in the process?
And again, they are a for-profit. What will happen the day they realize they can't pay the bills at the Alps with free users?
They can promise whatever they want, Google's motto was "Don't be evil".