Great article! I applied for/joined each platform. A few issues though, as I was signing up for viberate, I saw an option to submit a Spotify page OR Facebook page. I am on Spotify so I submitted both my Spotify and Facebook pages. To test it out I submitted another artist that I know of who doesn't have a Spotify page, but does have a Facebook page. The submission went through and I am awaiting confirmation. I will post the results when I am notified. If he is accepted on the website as an artist then Spotify is not (or no longer) a "must have".
Also as I am trying to access the voice.it website, I am getting an error page. This may just be for today though (1/31/18).