Windows 10S
They'll no doubt be hoping this will help promote locked-down desktop ecosystems like Windows 10S, with monetisation being a spin-off (if not primary) benefit. With the shift towards so much being browser-based these days, that will suit most non-power users, but relying on their buggy and inconsistent (speaking as a suffering developer) proprietary engine was a major hindrance for take-up and demanded the one-off convert-to-Pro backstop offered to customers unwitting enough to fall for 10S thus far. They'll be able to push it much more confidently now, for better or worse.