A lot of songs on the Billboard Hot 100 (most aired and streamed songs in the past week) are over 6 months old, including "Thunder" at #19 and "Perfect" at #2. "Today's top hits" is not "today's newest songs".

It's small compared to paid subscription offerings (or ad-supported free tiers of something like Spotify). Which means it basically works fine as background music but isn't great if you want to listen to specific things, especially current music.

It is. Amazon Prime Music's selection is dismal. I've discovered some great new music with it, but not a lot, and it takes a long time to filter through all the shovelware to find good stuff that I don't already own.

I get these titles in Apple Music daily playlists a lot too, so it's not just Amazon.

I see topX lists as "what studios want you to listen to". Only Spotify's discover weekly seems interesting at all.