[cdesai]

> Google's Play client libraries are still used on CalyxOS by the apps using Play services.

They'd also be used on GrapheneOS, and anywhere else basically.

> WhatsApp is clearly a proprietary service too, and CalyxOS is integrating that into the Dialer app.

The integration is entirely done into the open source Dialer app and generic enough that it could be extended to any apps that have phone numbers. Signal and WhatsApp are simply the most popular amongst those.

[FieryBinary]

>They'd also be used on GrapheneOS, and anywhere else basically.

The issue is that you're giving Google services privilege and integration not available to other apps.