CE Android has limited site into the content of other apps. It sees any app that is used; but it doesn't necessarily see the activity within the app. In the specific case of Spotify, CE does not evaluate audio files. In the case of Instagram, the CE program does not scan the individual images/photos because it gives a rating to the site as a whole. Currently it is rated MT (Mature Teen).
If you're asking about CE for iOS, just let me know and I'll get back to you. Thanks again for asking,