Death Grips' mixtape "Exmilitary" is not officially available on Spotify because it is a mixtape that extensively uses samples which were never officially cleared for distribution. The mixtape was released independently and was originally distributed for free, with many samples used without clearance. Due to Spotify's copyright policies, which require cleared samples, "Exmilitary" was removed from the platform. However, the mixtape remains available through other channels like the band's website, SoundCloud, YouTube, and in physical formats such as vinyl, CD, and cassette. The single "Guillotine" from the mixtape is still available on Spotify since it is separately cleared.
In summary, the main reason "Exmilitary" is not on Spotify is the uncleared samples making its presence on the platform incompatible with Spotify's copyright rules.