Concerns center on a small number of companies controlling search, social media, app stores, and cloud infrastructure simultaneously — giving them outsized influence over what information and commerce look like online. Concerns center on a small number of companies controlling search, social media, app stores, and cloud infrastructure simultaneously, giving them outsized influence over both online commerce and the flow of information. Advocates argue this concentration of control makes healthy competition structurally difficult even for well-funded challengers. Advocates argue this concentration deserves scrutiny even without proof of explicit anticompetitive conduct.