Monopolies are not illegal, anti-competitive practices are illegal; there's a subtle difference.
You're right. Duopolies aren't great either and just because two companies are in fierce competition doesn't mean everything is good with the law. Both companies might be engaging in illegal anti-competitive behavior.
You're right. Duopolies aren't great either and just because two companies are in fierce competition doesn't mean everything is good with the law. Both companies might be engaging in illegal anti-competitive behavior.