[wkat4242]

It's a service they sell to eg DuckDuckGo and ecosia. I think the og bing is just there because they still think Google may fall out of favour one day. Oh and they offer a corp version spiced up with internal results from SharePoint.

[mtdewcmu]

I think they also make money from people that don't know the difference and use it because, for instance, it's the default in Edge when you search from the URL bar.