Apple Music is just like Spotify, one can have an individual subscription or a family subscription (with only two people, one gets a fifty percent discount for the second user). If you are talking about Fitness+ here, and it is (and always has been) available for family sharing at no additional cost.
You seem to be mixing Apple Music and Fitness+ in your comments. Fitness+ subscriptions - both stand-alone and part of AppleOne bundles - have always supported Family Sharing. Apple Music, has a Family Plan option, just like Spotify.