From a profit viewpoint, why should Microsoft support Edge?

WolfIcefang I think the value of Edge and Bing are more clear when evaluated not only as individual revenue-generating products, but also as infrastructure for Microsoft's wider cloud, enterprise and consumer services. New features as well as integration within/across platforms and work/life activities are all dependent on Microsoft control over their own browser and search engine. The decision to base Edge on Chromium was brilliant because it allows Microsoft to develop features important to it's own ecosystem on top of an open-source browser engine that already enjoys the broadest compatibility and support.

The new Microsoft Search functionality is a good example of cross-domain integration. Information can be surfaced from work domains and integrated with search results from the Web and your local device. I'm also making great use of the new multi-user profile capability. I run a personal browser session along with multiple Edge profiles authenticating to client domains. These kinds of features would be a nightmare if not impossible to implement and support in someone else's browser or search engine. 

BTW, in my experience, Bing caught up with Google search 5 or 6 years ago. I've been using Bing as my default search engine ever since. With the new fast, stable, compatible and feature-rich Edge on my PC and Android Edge on my mobile devices over the last 7-8 months, Chrome and Firefox are rarely used anymore.

Edit: Non-substantive grammar/clarity improvements.