Who posts raw output from cameras anywhere? This doesn't seem useful outside some niche use-cases (like security camera footage). At a minimum just about every recording is going to be re-compressed for streaming.
I bet the cameras' companies will start automatically uploading the real footage to their servers for attestation, and allow the camera owners to get those links, so people will just add that link on YouTube or whatever and say "See, its real, Sony vouches for it", heck maybe they will make their buyers to sign up with YouTube and do it for them.
I don't think it needs do be raw output. I'm pretty sure that signatures can exist within image and sound outputs that are reproducible when changing to other formats.
Yeah I’m not sure this makes sense when images are getting their third ifunny watermark.
Synthid and the like survive compression and decent quality rerecording.