This might be my misunderstanding, but isn't that pretty much the definition of collusion?
That collusion would be no different than what is occurring today among the ISP. They have non written agreements to not compete with each other in certain areas , hence the lack of competition. This is how they can stay in business despite being rated the most hated companies in the US year after year by their own customers. Only way that can happen is if you are the only game in town (monolopy)
This is only branching out their arrangement to now include the existing Online Oligarch as well.
Permissable business agreements include joint ventures, plans to supply one another when creating or entering a new marketplace, etc.
Collusion is functionally an illegal (and informal) business agreement.