What app? I’m not sure this makes any sense. If my device is encrypted at rest, and my data is encrypted in iCloud, it’s no different than collecting metadata from any source. I’ve yet to see anyone demonstrate this with iOS. If they could it would be international news like when pegasus spyware came around.
Plenty of audits for the lockdown mode and iCloud advanced protections that show it can stand up to state actors.
Don’t get me wrong, I love the work put into Graphene as much as anybody. Graphene is best yes, we all know. But out of stock Android, or stock iOS, Apple’s built far superior protections.