I'm switching from iOS, with the goal of reducing my exposure to surveillance capitalism. I've never used an Android phone, and multiple app stores and profiles are confusing me. I don't use many apps, even on iOS, so I'm hoping the switch to GrapheneOS will be relatively easy. However, I don't know if I need Google Play, and if I do, if it is best in the owner profile or secondary profile(s). Please help an old fool!
On top of all these questions, I still don't understand what are the privacy benefits to using Aurora Store over Play Store if I use a single-use fake email address with the latter?
App examples:
1) I can install Signal Messenger directly from their website (APK), give it permission to self-update, and it supports its own notifications system. If this is correct, then I don't need Google Play? Any downsides to installing Signal this way instead of with Google Play?
2) I've read that Protonmail works without Google Play, but if I want notifications then I need to install Google Play. If this is correct, and I want notifications, what is the privacy disadvantage to installing it in my owner profile where I run Signal? And if Protonmail and Google Play are in my owner profile, should I then just install Signal from Google Play, too?
3) I use Spotify--a lot. Yes, I know it conflicts with my threat model described above, but I knowingly choose to use it because I value music discovery that comes from my listening data. Since it's a non-FOSS app, should I install it in a secondary profile, even if I use it all day long? Or, if I already am running Google Play in the owner profile (to get Protonmail notifications), then is there a privacy disadvantage to having Spotify in the owner profile, too?
TL;DR: What are the privacy threats to having Google Play on the owner profile? Are these threats mitigated with putting Google Play in secondary profiles? Does Aurora Store offer additional privacy benefits compared with using Google Play with a single-purpose email alias?
Thank you for your help!