Specifically the part where engineers get paid the same way as artists on Spotify.

So a handful will make a buttload but the vast majority won't make enough to pay rent?

So not at all for their work and with a reverse Robin Hood model? That would be terrible for software. The way artists gets paid on streaming is a genius play at catering to the biggest artists and labels and screw over the smaller ones, especially true on Spotify with their freemium model