The problem with this approach is that the rest of world is not going to be waiting around for a handful of idealists. They are going to use what solves their problem. You can bet that at this moment there are at least a dozen junior VCs in Sand Hill Road looking for investment opportunities in something that be sold as the next reddit and are ready to use their PR machine to convince the masses that this new shiny app is "completely different", "revolutionary" and "learn the lessons from the failure of reddit". You and I may know this is total bullshit. However, when the alternative is just a handful of developers who bans those who come asking for features and act like they don't care about the majority of Joe Average, who do you think they will choose?
I get when people say that they want to work on something and they don't care that their pet project doesn't become big, and I wish we lived in a world where more people could simply work on their things on their own time. But I also understand that if we really want to fight against the Evil Corporations (tm), we need to beat them at their own game. That will involve doing all sorts of unpleasant things like "deal with customers (even the rude ones) by addressing their needs instead of telling them to fuck off" and "how to make enough money so that you can compete in the job market for the best talent instead of depending on Fred who is the only one working on a crucial feature, but needs some time off to study for his finals at Uni".
How is that any different from employers that offer unpaid internships or a clients that ask newbie photographers to "work for the portfolio"?
No one is talking about "a lot of money" here. Whether you want it or not, you are expecting to get people to work for you (and you can call it a "co-op" all you want, whoever decides who-gets-how-much is the actual boss) for less than what they can get in the job market.
Yeah, and this is a sacrifice that you chose to make. Which is totally fine. I also took some time to work on my own open source project long after the grant money was gone. I just don't get how you think it is reasonable to ask others to do the same.