There's also already a crowdfunding scheme called "the private market". So far its existence has not caused governments to stop funding science. The way I see

There's also already a crowdfunding scheme called "the private market". So far its existence has not caused governments to stop funding science. The way I see it is that each of these schemes allows money to be allocated according to different sets of criteria, each of which we hope will overlap with the vaguely understood criterion "benefits society". Since the overlap isn't perfect (sometimes pathologically so), I'd argue that diversity of crowdfunding schemes is a good thing.