Missing the point
I spoke to a Microsoft bod at Cloud Foundry Summit a few weeks back; he told me that this Linux on Win10 is just to provide useful Linux tools for techies to make Win10 a more potent tool compared to macOS. I had also been to OpenStack Summit earlier this year, and I'd say that 85% of laptops were MacBook Pros at these open source gatherings. I'm sure Microsoft would prefer them all to be Win10 machines.
I was also surprised to hear that 1/3 of their Azure estate is running bare metal Linux, and they have a complete solution based on Cloud Foundry. He did a CF on Azure demo on his MacBook Pro, for a laugh, he did a CF Push from an app on his iPhone.
Microsoft isn't the same company it was under Balmer and Gates.