I guess YouTube doesn't really have any competition, i.e it's not like you're going to switch to the competitor video platform and search there. Your only option is to watch through multiple other videos before finding the one you want, which is great for them.
But just like how there were never any clips of Will Smith eating spaghetti before AI, AI is able to synthesize different existing data into something in between. It might not be able to expand the circle of knowledge but it definitely can fill in the gaps within the circle itself