Honestly, the benefit of streaming services is not being able to listen to music legally. It’s discovery. Playing a song I like and getting recommended a similar song turn an artist I’ve never heard of has introduced me to a lot of great music. That’s not something you can replicate by going to the webshop of your favorite band and buying their newest album.
The problem there is that scrobblers aren’t nearly as convenient as a streaming service. With a scrobbler I have to actively check out recommendations. With a streaming service I can just have it play related songs until I get one I really like.