Although, getting back to the original discussion; I personally don't think a decentralized "Youtube" would be enough of a benefit, or even an improvement. It depends what is meant by decentralized in this instance, since decentralized might mean that the platform gets overwhelmed by spam, and therefore contributes to its death. Obviously, you could say that going the community moderated route would work, but only once the platform is big enough, since at the start most people won't care, they'll only care if the platform appears good, without being actually attached to the idea.
First, I remember when Amazon was just a book store.
B) Spam was everywhere when youtube first launched, and people said the same thing about them and about twitter. I didn't really follow Twitter's rise (just useless texts I thought) but YouTube's solution was to throw more cheap storage at it until people got bored. :/
iii) We're having a pretty detailed discussion from a one line newbie subject that's probably reliant on selling the content anyway. No one is going to buy your map to the star's homes until you get some listings in there.