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.