Yes, Microsoft is certainly an oligopoly that abuses its position with sometimes unethical practices and Windows by default is full of all kinds of spyware and not very respectful of user privacy (although with a little knowledge you can disable these bad habits), but in point security is impeccable and perhaps one of the most secure OS currently. Apparently MS has learned a lot from the past, precisely because it is the main target of the attacks as the majority OS is. The defenses he currently incorporates are among the best on the market.