Back when Windows 10 came out, Cortana opened Bing searches in your default browser. Someone made a Bing2Google extension for Chrome, and Microsoft responded by making Cortana only open Bing searches in Edge.
Now that Edge supports extensions, I can make a Bing2Google extension for Edge, but Microsoft will never accept it. If I make a Bing2Google userscript for Tampermonkey[1], Microsoft will probably take down Tampermonkey eventually once they learn about the userscript. There is already a very simple userscript available[2] that you can install right now to get this "banned" functionality in Edge.
Edge's extension ecosystem is a walled garden. When it comes to browsers, I prefer freedom over performance and efficiency. This is why I'm still not switching to Edge. I'll give Edge another chance if/when they open up their extension platform to everyone. For now, it's useless without Microsoft approval.
I use Tampermonkey for some userscripts on other sites and I don't feel comfortable relying on Microsoft's goodwill to not remove this extension.
[1]: https://www.microsoft.com/en-us/store/p/tampermonkey/9nblggh...
[2]: https://greasyfork.org/en/scripts/11308-bing-to-google/code