Just choose the operator which gives you a chance to control your e-mail in the way you want to for free e.g.
-pop3 or imap
-using pgp/gpg - your keys with password
-autocrypt or not (delta.chat)
As Asa said, don't put all eggs to one basket. Protonmail creates another walled garden.
Remember, ca.20 years ago Gmail was perceived as a fency email. People paid to have one.
Currently Gmail refuses some people possibility log in even if they have password. You have no option to challenge this.