Since you're posting in the self hosted community I'll assume you're looking for a self hosted alternative.
I've been meaning to try out Hickory DNS. I too want to use DoH on my clients, and will use native Android/Firefox options to enable it client side.
Haven't settled settled on an upstream provider yet, so from Hickory DNS onwards I'll still need to find something else.
Or throw their support behind certain distros with said emulation layers, maybe even a desktop environment like Plasma with a "Microsoft theme".
Honestly I think it is a great idea either way.
Regardless of their commercial goals, if they put their weight into supporting the Linux ecosystem we'd undoubtedly benefit as a whole. For instance from common upstream bug fixes and increased user adoption of Linux by their remaining loyalist customers.