This ars technica article WRT Google’s Play Integrity (formerly SafetyNet Attestation) might be of interest for @Jolla (rather Seafarix than Jolliboys) due to these statements from Shawn Wilden, the tech lead for hardware-backed security in Android:
Wilden offered some hope for a future in which ROMs could vouch for their non-criminal nature to Google, noting “some discussions with makers of high-quality ROMs” about passing the Compatibility Test Suite, then “establishing some kind of relationship we can use to trust them.”
Personally I think this is only playing with words in order to keep AOSP Open Source Software (which bears some advantages for device manufacturers), but practically closing the Android software ecosystem completely, while appearing “not to be evil” to the public.
The reactions of the maintainers of GrapheneOS are primarily based on technicalities, interesting to read, but ultimately they come to a similar assessment, unfortunately.