You don’t need to decode video signals as RGB values to be meaningful.
The value is simply the abundance of data and the patterns that show up within it because most images are close to the ones before them. Suppose you sent every book ever written in English as ASCII data and someone tried to decode it as an audio signal. There is nothing in the data that’s going to show someone is on the right track or not. However with uncompressed video you can find patterns and the closer you get the more obvious it becomes.
The value is simply the abundance of data and the patterns that show up within it because most images are close to the ones before them. Suppose you sent every book ever written in English as ASCII data and someone tried to decode it as an audio signal. There is nothing in the data that’s going to show someone is on the right track or not. However with uncompressed video you can find patterns and the closer you get the more obvious it becomes.