Relax, everyone. This is why we have the whole capitalism, free market thingy. If someone with surplus money wants to stick their cash into some venture, good luck to them. If they can get it to fly, we are all better off. If, as more likely, they can't get it off the ground, they've wasted their money not mine.
Far better than the current approach to renewables, which is to tack on a huge and unavoidable tax to electricity to pay for stuff because we know it isn't (yet) working.