I was prepared to be angry at Google, but this probably stems from at-volume use of licensed material outside of the ToS. It probably impacts their deals with the music industry, etc. and requires intervention. (Not that this couldn't also be a salvo fired against an upstart competitor, but I doubt that's the primary reason.)

Seems like Discord could estimate the value of Groovy to its users, and if non-negligible, could come up with their own license deal. Perhaps with Spotify or another company.

The people to be angry at are the recording industry.