Recursive attribution (e.g. a profitable video used 10 seconds of a remix of a song ultimately belonging to xyz) would be fair. It should be easy for YouTube engineers to engineer profit sharing.
Say hypothetically that the song writer gets paid 100% every time their song gets played 100% in any video, why does copyright care at all? It's right to safeguard the primary creator's intellectual property to the extent of allowing them to claim share in profits, but it's strange to use copyright to restrict use.
Apoptosis is when single cells die on purpose for the development of an organism. I don't think it's unreasonable to at least hypothesize this extending to intelligent entities. Humans aren't xylem cells, but perhaps Zorklovians from planet Fleptar do this.
Or, you know, Alan Turing eating the apple. I think he was a pretty smart guy.