More progress is being made by companies understanding the drawbacks of Play Integrity API and the benefits of supporting genuinely secure and private alternate OS.

Quote:
> We have currently decided to allow GrapheneOS for use with the TK app, provided that the device's integrity check is successful. Google Play Services are still required to launch the TK app. Going forward, we would like to further reduce our reliance on them.

https://www.tk.de/techniker/versicherung/krankenkasse-anliegen-online-erledigen/tk-app/tk-app-geraeteauswahl-2023672#unterstuetzte-betriebssysteme-und-custom-roms