I admire your positivity and it's inspired me to take another look at where I left my (audio only) attempts. I sincerely hope you prove me wrong with getting streaming providers onboard.

For what my failed experience is worth, try getting some internal contacts at these companies. The public, and even "developer", contact channels for Spotify, Soundcloud, Tidal and TuneIn are a dead-end. At least, that has been my frustrating experience. Presumably if you throw them money they take you more seriously.