I think google play is a necessary thing for them to distribute in the sandboxed google play harm reduction feature they advertise.
Ascrescent is the open source self-signed app store they promote, that is fully open, and its in their app store as well - but has very limited apps (organic maps, molly, but not fdroid inside)… but Ascrescent does not require the apps distributed to be open source… so just like google play
The reason they don’t include F-Droid is they have a weird cultural bias against fdroid signing apps… they don’t really speak to the relatively new fdroid reproducible build chain where the apps are signed by developers, but built by fdroid… which is the far superior security solution (verify the developers built it, and verify the source used in the binary is the published source) that no other app store offers.
I agree it would make sense for the GOS app installer to include fdroid, its weird that they don’t, but their line is only developer signed builds… which, google play actually does do… google play apps are developer signed.
Reply As is working for me, for custom domains I setup in tuta.