I do actually believe the idea of everyone working together is a great idea, and so is not using copyrighted material... the problem is that only the latter aspect I believe can actually be made a reality. The problem the worries is, generally speaking, is that - especially in regards to art assets - people will tell others they are not worthy of their help if the person asking is not already established. People seem perfectly willing to help someone if they already have a name for themself, but these terms seem like they will serve to increase the difficulty of getting there. I fear this movement will create an access to resources having elite, because far too often you need stuff you can't just find randomly laying around. The only help non already made people will be able to find will be from people whose work isn't good, because they were unwanted by established elite who had no need of their crap, and thus the work made from it won't be able to establish anyone to a level where they can actually get access to good help.
Do not be confused, I do think it's a good idea people stop using copyrighted images and the like. I just think the alternative suggestion that you get the community to work with you to produce what you need will only work for the already most godly people here. Everyone else will be left out in the cold with no resources legal or illegal from this point on, or at least no resources of a quality such that anyone will ever care about their product.
You can enforce a ban on illegal material usage, and you most certainly should, but how the hell do you intend to enforce a truly communist sharing of help with no status tiers forming within it?