Have you started de-googling your life?
If so - are you using any of these awesome Google alternatives?
New to the concept? Read here - https://tuta.com/blog/how-to-leave-google-gmail
@Tutanota Immich is a nice self-hosted (!) Google Photos alternative.
@ArchaeoIain @Tutanota I don’t understand the point you are trying to make.
If you are specifically interested in getting Immich mobile client outside of Google Play, F-Droid seems to have it. And I’m pretty sure you can just build the app from source if you don’t trust the distributors.