I have been slowly degoogling my life by reducing my use of Google apps and switching to FOSS alternatives. I recently created a Proton account and tried to keep it completely isolated from my default Google account so as to not let it know what my Proton mail identity is. I have finished my transition in my desktop to the best of my ability and am planning to start the same with my mobile. The only thing I have done in my Android phone related to Proton is having downloaded ProtonVPN and signed into my account within the app. However I fear by downloading ProtonMail and signing into it, my Android phone would identify the email account, which could make this entire transition useless. Is there a way to avoid this situation or has the damage already been done. What does Google know about my Proton account, if at all?
I would think a big reason to use proton is to keep google (or another provider) from reading the contents of your email.
Why is keeping your ProtonMail email “hidden” important to you? Answering that will hopefully let us come to a better way of achieving the goal.
Also, anyone can figure out if you’re using Proton by the email address or DNS on the domain name.