That's always the risk with a business plan like this. Uber seems to have a similar business model, but the difference is that Uber is an easily scalable business that has become a household name. Investors are happy to keep throwing money at Uber until they have taken over the world, and then they can worry about profit. Not every business is going to be an Uber, so it's a big risk basing your business plan on requiring constant injections of cash until you become a billion dollar business.