I wonder whether they use the bluetooth device logging purely to develop their social graph. A person streaming music to their own bluetooth headphone using a f

I wonder whether they use the bluetooth device logging purely to develop their social graph. A person streaming music to their own bluetooth headphone using a friend's computer and Spotify account can be detected this way. I can't really come up with another purpose for it. Other than that, I'm not surprised by what they log. Virtually every company stores search queries, oauth grants, play history, ad interactions etc. Doesn't make it right of course.