it would be interesting to know how many of the 75 million free Spotify subscribers actually use the service. I have a free Spotify account but can't remember the last time I used it. many would have signed up after Spotify launched, perhaps tried it once or twice never to go there again. you can do anything with numbers for free services - the key is the paying subscribers. Apple are the newcomers here - let's see what their paid numbers are like in a year's time.
PS - note to self - remember to unsubscribe from Apple Music after 3 months. :-)
PPS - I have a paid Tidal account.