raccoondad Aurora is in no way less secure than getting apps with Obtainium, F-Droid repositories, direct APK downloads from such as Github, developer websites and other third party aggregators like ApkMirror for example. This practice is widespread.
What makes it more secure than them is that it gets packages directly from Google infrastructure according to your spoof manager, after authentication that is not directly linked to you (only through your device hardware, software, performance and network connection characteristics). Why would I want to use my own account to do that, even a throwaway when one is already provided and to everyone's confusion used in a mixnet with multiple other users?
I already know opinion of GrapheneOS development team and heard it from multiple sources so why not cite someone else for change?
Hang on, I know, creative thinking and independent opinions are not very well received here. Let me ask Naomi. Or perhaps the despised one might chip in.
I never claimed GrapheneOS devs are in Google's pocket, this was totally uncalled for. And I actually think that thanks to the hardening and controls GrapheneOS provides, using Play Store is a brilliant way to go about their lives but it won't cater for those who wish to get their privacy expectations to next level, albeit at a minor security compromise.