If I was Microsoft, I would be very reluctant to support Windows on M1 Macs.
The obvious disadvantage is the consumer will get Mac OSX for free with the hardware, and won't be too keen to pay much more to Microsoft. Apple will end up earning most of the revenue.
The strategic disadvantage is that as windows users move to M1 based macs, sales of PC hardware will drop, since the PC ecosystem is hobbled by a lack of deep integration, lower performance CPU's, lower profit margins, less R&D, etc. If volumes of sales drop too, it could trigger a cascade effect (fewer sales causes less R&D causes less desirable products causes fewer sales). That could kill consumer PC's entirely, which would be very bad for the future of Windows.
The obvious disadvantage is the consumer will get Mac OSX for free with the hardware, and won't be too keen to pay much more to Microsoft. Apple will end up earning most of the revenue.
The strategic disadvantage is that as windows users move to M1 based macs, sales of PC hardware will drop, since the PC ecosystem is hobbled by a lack of deep integration, lower performance CPU's, lower profit margins, less R&D, etc. If volumes of sales drop too, it could trigger a cascade effect (fewer sales causes less R&D causes less desirable products causes fewer sales). That could kill consumer PC's entirely, which would be very bad for the future of Windows.