In fact many current industries engage in illegal activities. Most often cartel behavior and price fixing. Generally this behavior is not curbed already becaus

In fact many current industries engage in illegal activities. Most often cartel behavior and price fixing. Generally this behavior is not curbed already because it's hard to prove price fixing without having concrete information about the communication. Technically you don't need to have communication, but it's hard. Sometimes all you need is one new vendor to enter the market place and not play by the old rules.