Constant youtube shilling for their new music service, it's actually pretty ok if you are used to using youtube to listen to music and the algorithm knows songs you listen to. Also, music videos, which spotify doesn't have.
I've never used spotify to find new music or new playlists, I only used it to listen to songs I already knew and liked instead of doing that, probably the stupidest way on earth to use it but that's how I've used it.