this post was submitted on 25 Jul 2023
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If you're on calyxos, grapheneos, or lineageos you can disable network permisions for that app. If not, use netguard as a firewall and block it.
https://f-droid.org/packages/eu.faircode.netguard/
If you have Google play services the keyboard could phone home through play services. Shutting off network access isn't 100% effective, especially for Google apps.
Obviously depending on your threat model this is fine.
If you are using Graphene, Play Services are themselves sandboxed and running as a user app with no privileges. I think they really can't be accessed on graphene, unless specifically choosing to.
I have a limited understanding. But I believe in graphene the Google Play services are available in the user account that is running the Google Play services. So if you have a Google keyboard running as your main user and you have Google Play services running in your main user account they can talk to each other. That's how apps like signal could use Google Play services for message detection.
But if you have a work account and a personal account and Google Play is only in the work account. The personal account cant cross talk to it.