Unfortunately, most industries on the internet are winner-take-all due to the network effect. Without significant government intervention, which comes with its own problems if done poorly, monopolies on the internet are nearly inevitable.
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.