deGoogled Google Play Apps with Obtainium

Obtainium allows you to install and update apps directly from their release pages, and receive notifications when new releases are made available. https://obtainium.imranr.dev/

Learn how to use the Obtainium App to Download, Install, Maintain Updates for Apps not available on Aurora Store for GrapheneOS deGoogled phone.
Of course Open Source Apps like Protonmail, etc can be sourced from Github and use the same procedure for any App you like or can find.
Using Obtainium is another option rather than using F-droid, Droid-ify, or Aurora store and is good privacy practice.

You can get / download Obtanium from https://github.com/ImranR98/Obtainium install the apk file or from droid-ify or f-droid.