Youtube is built around letting random individuals upload their videos, it makes a lot of sense for them to implement clever automated filters, contentID etc...

Youtube is built around letting random individuals upload their videos, it makes a lot of sense for them to implement clever automated filters, contentID etc... And even then it doesn't seem to work that well since I very often see videos popping up of Youtubers complaining about abusive demonetization and false-positive flagging. On the other hand I strongly suspect that the overwhelming majority of the music streamed by Spotify comes from "the industry" instead of artists uploading their own songs themselves. Implementing complicated filters (and playing the arms race game against people trying to work around them) is probably not worth it for them.