I managed a few artists in the past. Usually Spotify paid something like $0.0035 per stream but it ranges based on where the listen took place. One artist owned part of their catalog so earned the 100% on those streams. The rest of their catalog was owned by a major label where they were credited 15% of the streaming take (which was slightly higher than the direct rate) towards their unrecouped major label account.

I'd say overall though, streaming can be good for artists. It helps keep them fresh in fans ears (via auto-generated & editorial playlists) and provides a revenue stream for the older stuff that would never be selling in stores or iTunes now.