https://en.wikipedia.org/wiki/Spotify:
As of 2018, Spotify has 180 million active users, including over 83 million paying subscribers
https://en.wikipedia.org/wiki/Apple_Music#User_growth:
[...] ... and 50 million as of May 2018.[2] By July 2018, Apple Music had surpassed Spotify in terms of paying users in the United States
That is 133 million paying subscribers from these two services alone.
5% of just that would be 6,65 million subscribers.
I am curious when we will see the first user paying fiat for any service on Choon :-).