> There are no incentives for anyone to contribute

If you like PHP, you might want to contribute. I like tmux, for instance, and I contributed code to them. I did the same for Sysdig, and a couple other projects.

I like a lot of things as well, yet I don't feel I can contribute after work. I already spend 8 to 10 hours at work. I can't find the motivation to do more.

We can always work something into our day jobs. We always bump into little things we can improve here and there.

There are lots of drives besides greed.

Of course there are. But do they matter in our current system?

I don't understand the question. Greed exists in every human system because it's a human quality, not a system quality. Real people are driven by many, sometimes conflicting things at the same time.

Non-greedy action is by definion an action that doesn't directly and materially benefit the one acting. That is universal across all political and I would argue all biological systems.

And yet people do. PHP is a very active project.