You just linked to an article that dismisses your initial claim:

> Most economists now would agree on three fundamentals. First, tying is a pervasive practice that, in many instances, gives rise to substantial efficiencies, particularly when it takes the form of product integration. Second, the circumstances in which tying would lead to anticompetitive effects are very restricted. And third, not only are those conditions hard to verify, but also any attempt to balance efficiency gains against possible anticompetitive effects will prove a complex exercise.