Enable security settings in GOS, like MTA, debug code execution.. Then enable biometric access. You will see.
nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq834th4ryhcr6z6grm07jmdr4cc5wdl0wf2kvs3dmuc979fv4fpfshrvyn3 nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqtva8g98fx0fks0pt38vr75tv02t30qd5ev7n5v7fcpl6t44hf7kq5fm8mr nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpql024zsdxytpz3q97ngj068xkt42v7jklvl80yfm5f4vukfrf97gs52r26y nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqwjwj5r9ytyhgg7nwmy75t8xrhphw6c8kq94fuv0qdjg6g0fruffqntd6su
All Proton apps work fine on GrapheneOS. Proton Mail requires Google Play for notifications at this time. You can install sandboxed Google Play for that.
Discussion
nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq834th4ryhcr6z6grm07jmdr4cc5wdl0wf2kvs3dmuc979fv4fpfshrvyn3 nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpql024zsdxytpz3q97ngj068xkt42v7jklvl80yfm5f4vukfrf97gs52r26y nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqwjwj5r9ytyhgg7nwmy75t8xrhphw6c8kq94fuv0qdjg6g0fruffqntd6su nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqj8a8xa93cxau3zpreffmwezde09t36p72fm5e53t6dkcquttgqjqmaqhrk Not all apps work with dynamic code execution blocked if that's what you're talking about. It's not blocked for user installed apps by default and gives clear errors showing it's blocking dynamic code execution so people know that's why an app wouldn't be working.