I'd like to add support for various streaming services in the future. There is already a preliminary API that allows plugins to add music to the data store, which can be paired with other plugins that control downloading and decoding of audio data. It should be technically possible with the current system, but I haven't had the time to implement any services yet.

I might be out of date, but it was possible to integrate for premium accounts. Free users couldn't use that, of course, because then they wouldn't get the ads.