[52-6F-62]

And if they did have their cloud backup enabled and it copied over some photos taken for work then wouldn't they immediately be likely in breach of whatever NDA they signed?

Sounds like a lose-lose and I'm a strong believer in that if a company the size and as wealthy as big G wants a contractor to make use of a device to accomplish a task for them, they can provide the device and do what they will to it afterward and then re-purpose it for the next round of business. This isn't a new operational pattern, and I've never experienced otherwise. They don't need to buy new, just keep a supply of devices for contractors.