Perhaps I just did something stupid, but I just found Bing and anothernMS app in my Android phone's app list... never explicitly installed those. I do have Authenticator, though (for work). Has MS stooped to piggybacking their crap from others silently now?
LineageOS? plus Magisk (yes I have rooted it, so perhaps that allowed an opening somwhere). I will have to watch to see if anything re-appears I suppose.