Affected devices
The requirements apply to all “Google-certified Android devices” which includes:
Devices with Google Play Store Devices with Google Mobile Services (GMS) Devices with Play Protect All mainstream Android devices from manufacturers including Samsung, Xiaomi, Motorola, OnePlus, and Google Pixel
Custom ROMs without Google services & uncertified devices are not affected by these restrictions.
From the link
eleitl@lemmy.zip 4 days ago
On GrapheneOS Play Services is sanboxed, so it cant affect other installation sources. It’s just one source of many.