Was this feature not a thing 3 years ago? I don’t know why it bothers me, but I wish they would add some banners for their more active communities. It makes it just a little bit more official looking.
Edit: I believe the instance itself is also lacking a banner.
I tried uploading a banner for a community I mod and was met by a JSON parser error message, so that’s not happening there until there have been a few more updates.