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?
If you’re that worried you should really switch to a degoogled Android like GrapheneOS. But fwiw I doubt google would know your Protonmail address just from logging in through the protonmail app
Doesn’t change anything. On GrapheneOS, you still need to install play services to get push services working on ProtonMail. Another privacy friendly email provider, Tutanota, they wrote their own push notification stuff to get it to work on degoogled phones specifically.