Bump with a related question: I have the full Proton suite installed, and noticed that Proton Drive (currently 2.32.0) has MTE enabled, whereas the others don't.
I have done no manual overrides on any apps, just happened to be checking out the exploit protection settings and stumbled upon this discovery.
Could Proton quietly been moving toward MTE compatibility, specifically with GrapheneOS in mind, and are able to tag this in an APK manifest (or similar)?
Or, is the GrapheneOS team keeping tabs on which applications are compatible and flag them in a config?
The explanatory underneath the setting only states that MTE is enabled for "third-party apps known to be compatible", so that would point to the latter. But then it also says "e.g. apps that don't have native code".
I figure Proton Drive pretty much has native code, though...? 🤨
So what actually determines compatibility?