"Modern versions of Windows include free tools like Defender which are just as good and appear to have less of a performance impact on the computer. But if they really wanted to have a long-term impact on desktop as a vector for attack on web services I’m surprised they didn’t start, sponsor, or promote an Open Source equivalent of McAfee. This seems like a space very well-suited to address with an OS tool in the digital commons, much like a Windows anti-spyware equivalent of SpamAssassin, with self-updating rules and a completely transparent process." Exactly