Nevertheless we have to keep in mind that at first, those companies had key value proposition they had to explain. Like the for Uber and the “pay from your phone” feature (the one that seduced me).
Now that they are famous, the can afford to have a much simpler landing page, knowing that their clients are doing the job of explaining to the others what’s good.
Even though time helps a company to find its product market fit, they also have to talk differently to their early adopters. They will be in charge next to convince the others. It is then important to be explicit. Once famous, the company can afford a simple, minimalistic message and design.