I don't think it's so much an issue of size as vertical integration. In this case, you have someone providing BOTH a platform AND products on the platform. Th

I don't think it's so much an issue of size as vertical integration. In this case, you have someone providing BOTH a platform AND products on the platform. The same issue happens with Internet, where one company provides both the infrastructure AND the ISP services. In some countries (Japan), it's not legal to own both the platform and a service on that platform. If a company provides a marketplace, they should not be allowed to also sell their own products on that marketplace because it makes the marketplace inherently unfair.