This project is very unique from most that you would mention. These guys clearly had some heavy funding out of the gate, and are not using Kickstarter for their entire development process. 50k is EXTREMELY low for a game, because they don't need the full development funds, they already have a lot to work with. They just needed an extra boost to make this a reality in the immediate future, instead of being a pet project for a few years.
On the other hand, BMX The Game is being made by a few guys with computers and nothing else, and was planned to be funded entirely by Kickstarter (and is running on donation fumes as is), these guys didn't have the early funding for motion capture, they didn't have advertisement deals out the gate to buff up their funds, they're running from scratch which makes it a lot harder.
The big thing here is that, well, yea, nothing is stopping BMX from taking your money and running, but they already have a functional, working prototype for something that will make them far more money if they push on with it. That's motivation enough to trust them. If there is nothing to *show for your progress* and they are taking donations, that's when things get real sketchy.
also, renowned companies ARE dominating the market, just without Kickstarter because the development for big companies is in the millions, and asking that much on Kickstarter would be a PR nightmare when people know that they can afford it themselves.