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The Librem 5 uses a bottom of the barrel, standard industrial CPU from 2017 with no updates. It is no more open than a Google Pixel or any other mobile device. it lacks proper updates, isolated radios, and any form of hardening. The kill switches are also useless if your device is fully compromised and turned into a spying device, all of your data is already gone. The only thing the switches do as a last resort is block voice recording, which is an improper way of doing it since speakers are essentially just microphones in reverse.

I'm not familiar with lineageOS but with GrapheneOS any off the apps don't have privileged permissions this includes the Google play services. Google play services works like a normal app via Sandboxed Google play compatibility layer. The layer teaches the play services work like a normal app in standard app sandbox. Because of that, the check of side loaded apps whether or not have been verified by a ID via privileged GSM services are not possible. https://grapheneos.org/features#sandboxed-google-play