They have made the distinction before. If you build your own aircraft it can be certified as experimental. You can do anything you like with it that you might do with a Cessna, except commercial operations. I believe you can take a friend for a ride and split the fuel costs, but you may not profit. Why the type of plane matters is not clear to me. Likewise, flying a drone is legal, taking video is legal, why should profit from it be illegal? I don't know.