They seem to pathologically not be able to help themselves, even with products that don’t need to be promoted that way. I used Outlook for Android for years because it was actually quite good. Had a multi account inbox view, true dark mode, Galaxy Watch compatibility when those were all rather unusual features. But then they started trying to put Bing search in my long press menu system wide, using Outlook as the Trojan horse to do so, and I just found that too obnoxious