Many people are wringing their hands about Microsoft partnering with Google to gain control over the Internet.

Many people are wringing their hands about Microsoft partnering with Google to gain control over the Internet. But Microsoft abandoning the EdgeHTML browser engine is awesome news. Microsoft’s EdgeHTML was the last closed-source browser engine. Now, all the browser engines will be open-source.

I think it's been inevitable for some time. The article at https://alternativeto.net/news/2018/12/new-chromium-based-microsoft-edge-will-support-chrome-extensions-also-on-xbox-one also confirms that.
https://www.howtogeek.com/398073/how-microsoft-is-about-to-make-google-chrome-even-better/