We're heading into a world where it would not be very hard to bombard the public with a large number of long form videos of highly convincing videos of anyone in the world ranting on any topic and acting out anything they want, and we would have borderline no idea if it was legitimate.
Combining that with our media climate and already runaway problem with monetary and political incentives for fabricated stories seems really dangerous.
You could make a video of Neil Armstrong and Nasa execs talking about how they faked the moonlanding, or even much more nefarious fake content confirming conspiracy theories for political ends.
What will we use as a scalable filter to know what is actually going on, and how will we keep that content from manipulating public discussion?