eBay is a special case, they configured it awkwardly.
- If the app install source is anything but the play store, it won’t run.
- The app listing in the play store is only available to devices running certified Android.
This would lead us into a dead end if it wasn't for the following modification we introduced in update 2025052800:
disable anti-competitive code being injected by the Play Store into apps choosing to enable "App integrity > Automatic protection" when there's a valid Play Store source stamp signature (proving that it's an unmodified app from the Play Store, so we aren't disabling an integrity check) since it prevents using the apps on GrapheneOS when apps also choose to enable "App integrity > Store listing visibility" with either the "Device integrity checks" or "Strong integrity checks" values enforcing having a device licensing Google Mobile Services and running the stock OS (circumventing this is protected by the DMCA exemption for jailbreaking)
eBay doesn't check for the play integrity status within the app so once you've overcome the initial hurdle you're off to the races.