I don't know what are you asking for. Why is it more secure using Gmail + GPG or Delta.Chat ? Your keys your data. Protonmail scans your emails and possesses your private keys. Why I don't use Gmail? I don't like it.
Thank you for the explanation.
https://i.nostrimg.com/f04a6c94e7ab238a2e30aede3f5ab8bc348e4af2721685e6d2072e72b14e1979/file.jpeg