Open_Source_Enjoyer that then can extract data from every other closed source software over Inter Process Communication
This is completely wrong. This has nothing to do with licensing or source availability. There is no direct correlation between security/privacy and proprietary or FOSS. If something, proprietary is often more secure than FOSS.
Apps cannot just extract any data through IPC. Like I explained, IPC requires mutual consent. Google Camera talks with Play Services because it contains Google libraries and is from Google. It doesn't need Play Services to "exfiltrate" data or do tracking/data collection.
Proprietary and closed source code also is not a black box. It is perfectly possible to fully audit what closed source code does, the source does makes this easier but is in no way required.
Open_Source_Enjoyer What are these security issues?
https://xcancel.com/GrapheneOS/status/1883895255142932816#m
https://gitlab.com/ironfox-oss/IronFox/-/issues/7
https://privsec.dev/posts/android/f-droid-security-issues/
Open_Source_Enjoyer F-Droid is a lot more strict than Google Play Store when it comes to what apps they allow in.
Those are very flawed and many can be trivially bypassed. It has been shown in the past that those requirements can even be bypassed for months without anyone noticing. (Example wireguard)
Open_Source_Enjoyer Aurora Store just mirrors they Google Play Store.
Exactly this is the reason why it has no privacy benefit.
It also is way less secure than Play Store, in my opinion even dangerous to use it, due to it not properly verifying the authenticity and integrity of downloaded apps and not having working auto-updates, leaving you potentially without critical security updates. It also tends to download wrong versions of apps or mess other things up.
Open_Source_Enjoyer IPC to extract their data with the one app that has a network connection.
This may be true, but Google cannot collect much data in the first place. Apart from what the libraries can access unprivileged (like some nonpersistent identifiers and similar rather benign stuff), they can only access the data that apps bundling them explicitly give them.
For example, Signal uses empty messages for FCM push, instead of sending the message content over it. Therefore it at most leaks the time of messages being received to Google.
Use an anonymous Google account without any PII or phone number associated for best privacy.
The described approach feels way over exaggerated and is certainly not necessary for most people to have good privacy.