Very bad news for anyone who has a Fitbit device. Google tends to destroy any "smart" devices they acquire; first they tie it more closely to their ecosystem, too much for comfort, then they remove features, then they get bored and neglect it, then you have a brick.
They don't support Spotify, or really any music app except the one (which I don't remember). Their subscription service provides no real value at all. Their devices track heart rate and nothing else. They simply don't innovate at all.