Sorry, I’m not sure I follow? Are you suggesting an ongoing thing where people just build on projects done by other people? Like Open Source software?
At any rate, from my experience, anyone trying to find a team to work on a side project for free with no end that I’ve seen all end up falling apart. Heck even teams formed during timed jams can fall apart, but it isn’t as often.
Can I ask if you’ve ever completed a project like what you describe? Do you find it easy to find the motivation to start a project with no end goal or immediate reward?
The reason I ask is because if I start a project that would take a long time, I want to see some payoff in the end, otherwise I lose the motivation over time. Game Jams ars short, and you are talking to people almost the whole time, so it’s like an experience, and a bit of fun!