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Thanks for the thoughtful post, MigL. The sticky wicket is that word “fair” since you and I may define it differently, and we may even apply it differently ourselves from one situation to the next. I tend toward seeking equity and am reminded of this great image:

Is this car idea serious? A subcompact car* has an interior volume of 2,405–2,830 liters (engine compartment, tires etc excluded) A Passenger cars compact* (PC/C) weights 1100 kg–1360 kg. So a regular car will float if sealed. Your idea is to build a car that weighs about 2 to 3 times more than a standard car does? And then make it fly by using four small propellers? From a commercial point of view; how is the fuel economy for such a vehicle if it is even physically possible? Example as comparison: R44 Police Helicopter has a maximum gross weight 1134 kg**. You propose a vehicle that is 2-3 times heavier than that helicopter and make it fly by using four 17 inch propellers. Second example: A commercial drone fitted with 21-inch propellers weights approximately maximum 15 kg*** at takeoff. *) There are different classifications; examples used to illustrate taken from https://en.wikipedia.org/wiki/Vehicle_size_class **) https://robinsonheli.com/r44-police-helicopter-specifications/ ***) Example: https://www.dji.com/matrice600/info#faq

So the profits don't come from their customers?

Where do you draw the line between something natural and not natural?

The trouble with Pascal's wager is that it's only a 1 in 3000 shot that you follow the right religion. Statistically, your God has already condemned you by accident of birth. You might as well have a good time.

I agree that doing two seems to be achievable, such as a car and a flying car, where all 4 wheels would be used for vertical takeoff and landing (VTOL), and then tilted forward for flight. The key to these vehicles would be the 4 wheels of the car, which would have blades to produce thrust. If they don't work in a flying car, use jet engines. For three (a boat), the car's wheels would be tilted at an angle and its blades would be partially submerged to give it forward thrust. For four (a submarine), the wheels would be vertical, but at right angles to the direction of travel, so that the car could go pretty fast, and naturally sink below the surface of the water due to its weight. I thought of a fifth method of travel (a hovercraft), which the car could accomplish by tilting the wheels parallel to the surface of the water, which would provide upward thrust greater than the car's weight, which would lift the car a short distance above the water, and the car wouldn't sink because the air would bounce off the surface of the water and hit the car, thus producing more thrust. So there you have it: The 5-in-1 car!