If hosting and bandwidth costs are soaring why not create a private, members only torrent tracker for downloading Originals? Have the download link be a magnet url. Setup the torrent server to authenticate whether or not folks are authorized to download or not.
Blizzard used to (maybe still does) use bittorrent to have people download World of Warcraft. https://finance.yahoo.com/news/blizzard-acknowledged-bittorrent-branching-gaming-100000278.html
Just gotta through authentication on the torrent server. Set uploading to only SLR's admins. But allow the network to provide the scale.