Microsoft Forum from this video:
https://answers.microsoft.com/en-us/bing/forum/bing_websearch-bing_unex_search-bing_appdev_other/bing-removing-many-sites-for-no-reason/6a37e741-4220-4dec-9aed-d53954a0503f?messageId=92f517fa-beaf-4d59-a1af-5c282a79c1e2&page=1