The Subscriptions feed error message is resolved for almost everyone. If you're still seeing it, know that it will be fixed soon – thanks for your continued patience! You can follow along here for any additional updates: https://yt.be/help/CBxM https://twitter.com/TeamYouTube/status/1119013035580878848 …
Meanwhile you let channels get easily copyright claimed for 4 seconds of background music or let channels get demonetised for “repetitive” content. When your own algorithm punishes those who do anything outside of their normal content. I think a massive fix is still in order.