This is nothing like Linkedin, Producthunt, etc it's solid, and it's also a nuanced way of looking at cooperation.
People can offer a wide range of different benefits to a venture, and by creating a system which appropriately quantifies and compares the types of value that all parties bring, it allows for a fluid system to come about that increases the likelihood of profit being generated and massively reduces risk for all involved.
If I work on something as a dev for 100 hours and someone invests $5,000 into a venture to buy required equipment, who contributed more?
If you can find a way to answer any question like this where both parties are happy with the outcome, now you have the power of someone with $5k + someone who can code, but it's done in a more flexible way than a startup because of the greater variety of those that can work together (you won't typically get a startup taking off with 50 people) and the ability to establish multiple projects run by one group of people (instead of a startup which is one project one group normally).
Good idea, should be implemented. Often people struggle to believe in things they haven't seen happen before. It's natural, but it's a curse against opportunity.
The whole thing sounds like a cluster f*ck from the get go
You're right that it wouldn't be trivial to organise everything properly. If you could though, it unlocks much faster financial progress for anyone involved. It reduces risk a lot as well.
Just taking IM as an example, there are a lot of guys that do really well and set themselves up, but then also a lot that work for months/years and invest a lot of money and get suboptimal returns or loses. If all of those guys that failed had have pooled their resources (time, money, knowledge, ability to research etc) and had set a single project to work on they would have most likely outperformed their own returns, and would get a result in a fraction of the time too.
Also from any project there are multiple angles for monetisation that might missed by a single guy working on his own. It's the reason that unions, gangs, governments and corporations run the world in their own respective environments. This can be applied to any environment.