I don’t think there’s any evidence of a global compromise but I think you’re right that China wouldn’t allow access if it didn’t ultimately control it.
I couldn’t find anything specific about iMessage but the keys are backed up to iCloud – and we know that’s compromised. I can’t imagine them leaving users the option to just not back up to iCloud to avoid surveillance, but I haven’t seen any specifics. Best to assume that under no circumstances do you ever have privacy from the gov’t in China or even when messaging someone in China.
Nah you were appropriately smart mouthed. The problem was my clumsy post intro.