Re: Is there truly a market in failure?
The fact that Windows Defender is made by the same company that makes the OS is obviously an asset, but perhaps less than you'd think. Windows Security (well, post-XP) uses specific hooks into the OS that any AV solution can use. Windows Defender isn't actually connecting to the OS in any substantially different way than Kaspersky (or F-Secure, or Avira, or...). You might imagine that it's baked into the OS's libraries in some fundamental way but that's not the design. For good reason, really - modular coding and all that. If Kaspersky think they can use Windows security APIs better than Microsoft's own product, then there's nothing that stops them trying. And actually, their product scores higher then Windows Defender consistently, so they seem to be doing it right.
Also, when was the last time Microsoft exposed NSA malware in Windows? Third Party is useful. ;)