Cryptography cant save us here, people will figure out how to send AI images to the crypto hardware to get it signed in months. Just would be another similar layer of false security.
Cryptographic signing means "I wrote this" or "I created this". Sure you could sign an AI generated image as yourself. But you could not sign an image as being created by Getty or NYT
A chain of trust is one way to solve this problem. Chains of trust aren't perfect, but they can work.
But if you're going to build a chain of trust that relies on humans to certify they used a non-tampered-with crypto camera, why not just let them use plain ol cameras. Adding cryptosigning hardware just adds a false sense of security that grifter salespeople will lie and say is 'impossible to break', and non-technical decision makers wont understand the threat model.
Possibly (who am I kidding. *PROBABLY*!) will use chatGPT to help them design the method :)