We're running into situations where the usage of smart phones and apps are becoming mandatory for using services.

For example: The UK has a digital ID requirement which is required for you to be employed in the UK. Additionally the EU digital identity services have a hardware/software attestitation that is required to run their apps. (Many of those which 3rd party software can't run).

Another example of this is the Australian eTA - (Everyone has to have a visa to visit Australia.. but the real only way to get a visa* is you have to get an electronic travel authorization which only works via an App)

https://grapheneos.org/articles/attestation-compatibility-gu...

Apps that ban graphene-os being used:

    myGov (Australian government app)
    gov.br (Brazilian government app)
    Ticketcorner
    Authy
    Chyrpe Dating
    TextNow
    mada Pay (Saudi NFC payment app)
    McDonald's (International app used for many but not all countries not including the US)
    Dott
    My SEAT (Connectivity for SEAT cars)
    SwissID
    Volkswagen
    BKK Faber-Castell & Partner
    TK-Doc
    TK-Ident
    TK-App (Blocks access to TK-Safe, TK-GesundheitsMessenger, fingerprint login)
    IO (Italian government app which uses it to gate access to the digital wallet feature)
    PosteID (Italian postal service’s app used to access the national digital identity system "SPID")
    Singpass

Likely referring to Android's Play Integrity/hardware attestation API (good explainer from GrapheneOS [1]) that is practically used to restrict what devices/brands/Android builds an app will allow itself to be run on.

[1] https://grapheneos.org/articles/attestation-compatibility-gu...