It's not like Microsoft hasn't been trying to make Bing look like Google Search for years (see this 7 year old article: https://betanews.com/2014/10/14/is-microsoft-trying-to-confu...) - but they have apparently concentrated on copying the format and styling of the results pages, the actual search page which the user first sees is still markedly different. But the "Bing wallpapers" are their USP ("Experience beauty every day - make Bing your homepage"), so they're not willing to give them up...