Ah, fair point. Though it does say at the bottom "note: streams show up on this list if they are set to "publicly listed" and if they have a minimum number of followers and recent activity".
I say if it's not popular enough to be in that list, or it's not set to public, go ahead and make your own.
And I know this isn't ideal, but you could also try manually editing the url of a stream to try and see if another stream exists. For example I found
imgflip.com/m/Puppies that way.