For eg. Spotify had to lower their price from $10 per month to $15 per month for 6 (family plan) because Google Play Music offered that price point along with YouTube Red. Of course, neither Google nor Apple need to make money from their music services. Funnily or sadly enough this is true for almost everything Google does other than Ads.
Most people would agree that Spotify is a better music player while each of Google's music apps are bad in different ways, but online subscription services are a market where people want to nickel and dime.