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?
Either I’ve just gotten blind for these messages, or it has never happened to me. I’m using Firefox and have been using it for years, but so far I haven’t really noticed these messages at all on Google services.