FWIW, YouTube still has RSS available:
https://www.youtube.com/feeds/videos.xml?channel_id=CHANNELID
https://www.youtube.com/feeds/videos.xml?user=USERNAME
https://www.youtube.com/feeds/videos.xml?playlist_id=YOUR_YOUTUBE_PLAYLIST_NUMBER
You used to be able to go into your subscription manager and download an OPML file with the RSS feeds for your subscriptions. I'm unable to find that buton anymore though.