He's already pointing out the problems himself:

The difference is that Spotify is a for-profit corporation. And they have to distribute profits to their stockholders before they pay the musicians. And as a result, the musicians complain that they're not getting very much at all.

Yea, so at Spotify the profits are distributed "equally" - meaning Taylor Swift with 1 billion listens per month gets 99.9999% of the profits, [[Obscure metal band]] with 100 listens gets $0.001. However, if I only listened to [[Obscure metal band]] and nothing else, shouldn't my entire $5.99/month go to [[Obscure metal band]]? And not be pooled with stuff I didn't listen to?

How would this work with a "Post-Open software administrative organization"? Ubuntu has 1 billion installs, my [[Obscure open source library]] is used by a couple of companies, and it's the only "Post-Open software" that those companies use - Do I get that 1 percent of their revenue? Or does administrative organization siphon it away, keep 0.1%, and send the other 0.9% to the top 10 "Post-Open Projects"..?

Companies would have to publish which "Post-Open software" software they're using, and to what extend. For example, if Ubuntu would be Post-Open-software, it uses loads of inner projects and libraries, which again use more and more libraries, some might being Post-Open software. You'd have to create a whole financial dependency tree per company to determine how to distribute their revenue fairly