Well, if the top 100 tracks from, say, 1961 to 2021 progressively get less musically diverse, with simpler chords, less harmonies, less timbral variety, lesser melodies, more repeatition, less dynamics, less genre variety, more infantile lyrics (something that has been studied and measured several time, e.g: ), etc, then it's not some "survival bias".
https://www.researchgate.net/publication/346997561_Why_are_s...
https://newatlas.com/pop-music-trends/23535/
https://www.nature.com/articles/srep00521
https://www.res.org.uk/resources-page/economics-of-music-cha...