Ohhh, for video AI, not like when they copy news articles to keep people from leaving their site.
Surprisingly I'm with Meta on this one. Training is transformative use, and anything legally published is fair game. Doing math about library books is not a substitute for any particular work. Archive.org doesn't need opt-in permission from every website. Video sites mad about keeping the files they sent you can fuck off. Basically - any argument against this requires making copyright even worse. Let's don't.
In this case they're surely training against these examples. Like, if you want video models to not generate porn... how do you expect it to know what porn is?