Pixel 8 Pro, Android 14, Spotify Premium build 8.8.76.667, Sweden.

Brand new phone and first day of use, and installed the app earlier today.  Spotify has somehow managed to drain 38% (!) of battery with 4 minutes screen time and 4h 44 mins background activity: https://ibb.co/TrG4jW6. I'm unsure about the length of background activity, too, since I've only been listening to podcasts and some music for two hours tops before completely closing the app. No downloads of playlists or music, either. 

The phone was warm to the touch for several hours after installation. The temperature dropped immediately after disabling Spotify from being able to perform background tasks. 

In the "View by systems" tab in Systems > Battery > Battery usage, it's clear that the CPU has drained a majority of the battery (33% vs 13% for screen) since it was fully charged, even though I haven't been doing any CPU intensive tasks for any length of time. 

Super weird, and it's the only time this has happened on any of the smartphones I've had Spotify installed on over the years.