There are projects like https://contentcredentials.org/ . If we want, with some effort we could distinguish between real and ai generated. If.
No individual actor - human or corporate - stands to benefit enough because "trust in reality" is neither easily measured nor financialized.
Some do care, e.g. some camera manufacturers or some news agencies. Surprisingly some social media platforms[1] want clear labels for AI generated content.
that's the easiest position imo. It's AI unless proven otherwise. No one has the time to place this much detailed on a random video when the purpose of the video is just entertainment. What this might lead to though is people losing (or not learning) the skills needed to separate real content from AI generated content
And even if it isn't AI, it is quite possibly deceptively edited. Content provenance will be important in the future.