That's what I was about to comment, 13 billion videos and the same 10 videos recommended in a loop, what a product failure.
However, that's also an opportunity that YouTube hasn't realized yet, they could become a primary platform for content if they had a better algorithm and a better search, it would help them to monetize better those subscriptions.
Youtube has one of the lowest per viewer revenue and the poor discovery isn't an accident in that.
Are you sure you live so far from that world?
My experience of YT is totally different, FWIW.
It's YouTube which thinks there's only 10 videos worth watching, not me.