There seems to be a very distinct difference between employee classes. Management and high value tech employees are treated very well while moderators, gig workers etc are treated as "human resources", quite literally. It seems to me that they put companies like Cognizant between them and the exploited workers to deflect criticism as "we didn't know, we've been told by our partners that everything is great". And on a…
The only problems I see are that someone could potentially upload a lower resolution version of the video a moderator has seen and then perhaps bypass the content id system (I don't know how tolerant they tend to be for situations as that). There's also the aspect of if we make it search out for distinct frames (like "scene change" type things), there's the possibility that some safe things could become auto-moderate…
I assume that most of these videos aren't manipulated by professionals to escape a ban by looking completely different (which actually would make it a different video), but that they are mirrored, cut, have extra material appended or, as you suggested, have their resolution changed. I'd guess that videos are easier to ID than, say, image data, because you have plenty of material to work with.
Are there well-organized troll armies attacking Facebook? Because trying to sneak a video in that shows an animal being abused and doing sophisticated changes to evade detection sounds weird on a platform where there isn't even (as far as I know) monetary gain connected to posting a video (as it might be on YT or for Email spam).