When you visit the Google’s chatbot bard’s website in Microsoft Bing. A New Button pops up besides the search bar which lets you compare bard results with Bing chat’s. I have no idea why they implemented this, well maybe to show off the their chatbot is better than bard or something?
Apple and Google have both done similar things. Osx will ask you to use safari if you install a different browser. Google shows “it’s better in chrome!” on basically all of their properties if you’re using non chromium based browsers. No one seems to really give a shit.