Ca/Nikon’s main targets are people who shoot fast, a lot and publish very quickly (e.g. sport photographers) and people who will spend an awful lot of time post processing (wedding, art, commercial shootings)

I’m not sure there’s enough benefits for spending processing time, effort and resources on cryptography on any of these fronts.

Now smartphone apps taking “secure” pictures have been there for a while, for use cases like crash site photo for insurance claims for instance. They do fill the niche I think.