It's not written for the layman but it's interesting to read about how terrible Proton Mail is for privacy since that's the one most people think about first. The assessment begins with the following and just gets worse.

"SMS is the only option (unless you want to donate, which would reveal your personal information of course); therefore their claim that "ProtonMail does not require any personally identifiable information to register" is a shameless lie. Update: a contact told me that Proton now includes the option to solve a recaptcha (still an evil) for confirmation; however, the option disappears while using a VPN. They must really want that damn phone number if you are using anonymizers! And the claim that you can sign up without personal data is still false."