Need Clarification on Commercial Use Restrictions

[Fin-Glim]

My Question or Issue

I would like to use the Spotify Web API with an embedded device that would allow a user to sign in with their Spotify account and play music either through search or their saved playlists for instance.

1. Is this considered a "Streaming SDA", and why or why not?
2. Would I be able to sell this device commercially?
3. Would I also be allowed to integrate competitor streaming services into this device?

I have already read the developer policy, but am still not clear. Any help on these points would be greatly appreciated!