Well, it's likely they'll only use the core rendering engine (Blink, formerly Webkit) and wrap their own application around it. Hell, with all the applications they've released or are working on with electron (Teams, VS Code, SQL Operations Studio), I'm far less surprised.

I've been hoping they'd come up with for a more shared model for applications in the node/npm ecosystem similar to Adobe's Air. If MS did a good job of such a platform from open-source with tooling to build applications that run everywhere, more power to them.