and ensure the need for users of other operating systems to run AV software and run scans for all kinds of crapware.

I have been using computers for 20+ years running a variety of OSes including Linux, MS-DOS, CP/M, every version of Windows since 3.0, Solaris and others. I have NEVER had one of my personal machines infected even when running Windows 95/98/NT/XP without any antivirus software while connected to the internet (though I was using a SunOS box for a firewall/proxy). In most cases, it is not the OS that is the determining factor for infection, but the user.

BTW, apps appear to be more commonly compromised now than operating systems.