>>28404406https://support.google.com/youtube/answer/9481328?hl=enBasically, I'd imagine they've given the EN Stars editor access to the channel (it prevents them from deleting published content and livestreams and the like but allows them to edit the channel, upload videos and livestreams, etc.)
This would mean that if they need to do something on the main channel, they'll be able to, but if someone goes rogue they won't be able to delete anything or the like and it can easily be reverted.
