I'm wondering since some of the cases were Patreon people with a large back catalogs that Vimeo is actually counting the bandwidth attributed to embedding their player or provide link previews as part of the total. A large list of embedded videos that never actually play might be costing Vimeo in bandwidth to just get them to where they could play. So a 'gallery' of posts might be burning them because Patreon isn't making effort to cache a preview image or something like that.