The only thing in that list that would is of interest to a government are messages. Fortunately no-one really uses iMessage in China. People use WeChat and (you guessed it) the Chinese government has access to these.
As for the End-to-End encryption of iMessage it is a bit overrated. Apple does the key management for you. So theoretically they could pretend that the key of your interlocutor recently changed (because new phone or something), it would just work transparently. So if a "nefarious" entity were to gain access to iMessage servers, they could use that technique to decrypt, "on the fly", the messages of whoever they want to spy on, without the clients knowing that this even occurred.
When you use "WhatsApp" you have the ability to get some kind of warning when the interlocutor's key has been updated. It's also possible to check each others' identity by scanning some kind of QR Code. But the app does not really put any emphasis on which accounts have been verified. Signal is about as bad as WhatsApp. My guess a government that wants to spy on your WhatsApp/Signal messages probably could, because most people would notice the key change warning nor understand what it means.
Only Apps which makes a big fuss about key management (Threema for example) are properly End to End encrypted, with no possibility for Big Gov to hack into servers and spy on you by adding their keys to conversations. But then they would probably just hack the OS on your phone at this stage. In fact that method, is probably better than messing around with iMessage/WhatsApp servers. You bypass ALL forms E2E encryption, and you get access to everything else, with one swift hack. I bet the NSA and their Chinese equivalents have such hacks in reserve for very juicy targets they want to spy on.
With the kind of unlimited budget the NSA has, it's hard to imagine something they cannot hack. That is why big A-list targets like Bin Laden went totally off-grid for communication.
As for the End-to-End encryption of iMessage it is a bit overrated. Apple does the key management for you. So theoretically they could pretend that the key of your interlocutor recently changed (because new phone or something), it would just work transparently. So if a "nefarious" entity were to gain access to iMessage servers, they could use that technique to decrypt, "on the fly", the messages of whoever they want to spy on, without the clients knowing that this even occurred.
When you use "WhatsApp" you have the ability to get some kind of warning when the interlocutor's key has been updated. It's also possible to check each others' identity by scanning some kind of QR Code. But the app does not really put any emphasis on which accounts have been verified. Signal is about as bad as WhatsApp. My guess a government that wants to spy on your WhatsApp/Signal messages probably could, because most people would notice the key change warning nor understand what it means.
Only Apps which makes a big fuss about key management (Threema for example) are properly End to End encrypted, with no possibility for Big Gov to hack into servers and spy on you by adding their keys to conversations. But then they would probably just hack the OS on your phone at this stage. In fact that method, is probably better than messing around with iMessage/WhatsApp servers. You bypass ALL forms E2E encryption, and you get access to everything else, with one swift hack. I bet the NSA and their Chinese equivalents have such hacks in reserve for very juicy targets they want to spy on.
With the kind of unlimited budget the NSA has, it's hard to imagine something they cannot hack. That is why big A-list targets like Bin Laden went totally off-grid for communication.