We're not talking about individuals here, we're talking about corporations. Collusion between companies for the sake of negatively affecting the market (such a

We're not talking about individuals here, we're talking about corporations. Collusion between companies for the sake of negatively affecting the market (such as establishing a cartel) is illegal in any jurisdiction with proper, functioning laws. As I mentioned before, this is similar to the no-poaching agreement which they got into trouble (not nearly enough though) before.