I made a quick playlist with some of them:
https://open.spotify.com/playlist/0yN95wNVfKzGDS4vk9vGxN
Tracks are easy to spot as they are all the same lenght (1:37), but later Spotify also played/recommended a shorter version (1:08).
The evil idea here is to flood Spotify with maybe thousands of fake songs/artists to make some money from royalties.
For sure, it's a miserable experience for the listener and I fear it will only get worst.