Microsoft & Bing search engines

Avast has regularly warned me against using Microsoft & Bing search engines.

I have had this investigated by my `Team Viewer’ technician and he assures me all is well and I can continue using theses browsers.

Please explain why Avast advises removing them and then I can send the information to my technician.
Thanks

Both Microsoft and Bing aren’t browsers.
What part of avast is advising to remove them?