Today, Microsoft announced that they will roll out changes to Cortana so that only Bing and Microsoft Edge can be used for utilizing its functionality in Windows 10. Microsoft will forbid redirection of the taskbar search box to Google or any other engine, as well as launch exclusively Microsoft Edge to show more details of the search. The searches will redirected back to Bing and Edge for those who customized it to use Google search in Chrome or Firefox.
Unfortunately, as Windows 10 has grown in adoption and usage, we have seen some software programs circumvent the design of Windows 10 and redirect you to search providers that were not designed to work with Cortana. The result is a compromised experience that is less reliable and predictable. The continuity of these types of task completion scenarios is disrupted if Cortana can't depend on Bing as the search provider and Microsoft Edge as the browser.
The changes will affect all users without installing additional patches or updates. They will be rolled out via Cortana's server-side backend.
This move allows Microsoft to increase the search engine ad revenue and usage of both, Bing and the Edge browser. Microsoft claims that this will benefit the end user, but clearly the choice is going away from the user in this case. Many users prefer alternative search engines and browsers even if they have upgraded to Windows 10.