windows 10 hardly ever crashes
laymen don't care about open source.
I would add something about viruses and the size of the target being why most are written for Windows systems
I don't know how diversity of OS would work.
I realize it would be expensive
And who should pay that bill, you?
Windows viruses don't normally work on Linux. But there are many legitimate programs (such as Libre Office) that work on both.
I realize it would be expensive, but all Microsoft has to to is create and distribute (say) 3 other operating systems that cannot share viruses and ensure that each variety gets roughly equal distribution among users.