https://www.androidcentral.com/apps-software/sony-in-camera-authenticity-detailed
The company, alongside the Associated Press, seeks to remove the guesswork in a photo's legitimacy.
With your current phone, go ahead and take two pictures - one normal, the other a picture of a picture of that thing
Now look at the two, and tell me you can't tell in a split second that one is a picture of a picture. There's a reason that it's a running joke on the internet that people need to learn to take real screenshot instead of taking a picture of the monitor - there's always annoying and obvious artifacts.
You’re imagining a future where screen resolution doesn’t improve and lenses can’t solve these issues? Are people really this short sighted?
Except smart phone cameras will also improve - if anything, I'd say that over the last decade, the average smart phone camera has improved at a much faster rate than your average computer monitor.
Combine what I said with all the other Metadata that will be collected, and I'm quite skeptical that you could fool an actual professional with your scheme.