I don't particularly care what the current case law says, antitrust has been eroded for four decades to the point of being a joke. We need to overhaul this around the world and tame megacorps everywhere.
The behavior is plainly monopolistic and anticompetitive on its face. That it does not suffer judgement as violating any laws about such conduct is a sad reflection of our government corruption and unwillingness to regulate the corporations that provide most political funding.