Channel Strategy & Niche
Featured Video for Returning Subscribers
Also called: featured video, spotlight video, returning subscriber video
YouTube Studio lets you spotlight two different videos on the channel page: the trailer aimed at non-subscribers, and this one, shown to people who have already subscribed. A returning subscriber does not need the pitch. They would rather be handed your best current video.
Almost everyone sets it once at launch and forgets, so two years later a stale upload is still greeting the people most likely to watch something new. Change it when you publish something you are proud of, or point it at the video that opens a series worth starting from the beginning.