My main idea is that freelance sites are sort of broken: you pick a worker, he works on things for a while and then you see if he screwed up or not. You can't

My main idea is that freelance sites are sort of broken: you pick a worker, he works on things for a while and then you see if he screwed up or not. You can't really trust his profile. Reviews are also often inconclusive. It would be better if you could submit a small milestone, let multiple people work on it and pick the best result. Then continue working with that developer. And then this can be expanded into a platform where not only a single person can be an employer, but people can combine their funds to crowdsource various tasks. Good example would be open-source projects.