My guess is that Microsoft thinks this can be deployed with standard, company-wide policy across platforms (mostly) with their IT management tools which poses a unique advantage.

In reality, however, knowing how much difference there is between OSes, how tricky it is to configure these things to make them actually useful, and how bad Microsoft products are, I'm not enthusiastic about this project -- there are so many others on the market already, and I'll wait to see if this gains traction.

(Notice that on MacOS it only supports seatbelt? That's not nearly the same as microvm.)