Youtube is a service provided by their partners, they do not provide "commodities", nor do they provide products and nor do they make any form of cash from users on their site.

Digg.com has workers, of course they do, otherwise there is no site. They themselves are not a business either, it is yet another service provided by an actual business, they are merely a service which doesn't make money. A business is formed to make money, not to become a charity.