Is zoom or anyone else obligated to tell us about all the means of identifying the original viewer/leaker? Shouldn't we assume there are all kinda of steganogr

Is zoom or anyone else obligated to tell us about all the means of identifying the original viewer/leaker? Shouldn't we assume there are all kinda of steganography being employed? It feels like enough information could easily be hidden in PDFs, images, videos, and you wouldn't know unless you're doing bit-comparison to others' versions of the same. They might also be using a small number of range of methods and you won't know which methods you haven't seen yet so you can't make assumptions about the next file based on the previous one.