I would love a regulation for companies that they must make all user contributed data freely available for everyone. This way YouTube (and Facebook and Twitter and...) would not be a data silo but just one of many access portals to that data.

I know this is a question of values, of what is considered "just". But for me it would feel fair if all the 20k reviews of the nearby mall on Google maps would not be Google's property but belong to everyone, since many many people contributed to it out of goodwill.