Comment by pitnips

But it is a network effect. The more people that use the service, the better that service will be. If only a few people used Uber, there would only be a few drivers. This would lead to high prices and poor service levels. The more people that use Uber, the more drivers there are, and the lower the price and better the service. That leads to consolidation to those services with a high number of users, and those services will be the only ones that survive, hence the network effect.