I think they do in the context of “even including material shot by amateurs with their phones” and comparing them to a market that includes self-published books.

People often hire professionals to shoot them.

IMO self-published books would be better compared to self-published movies (which isn’t what the original commenter said, but they were just too obviously wrong).

So this would include things like YouTube videos, Twitch, etc, but not a private wedding video that doesn’t get published.

I bet the videos still win.

a lot of those 500k “books” are about as similar to what we perceive as real books as wedding videos are to blockbuster movies