So it would be ok to live or buy a house at altitude, simply for the benefits of breathing thin air in order to boost red blood cell count and getting a performance advantage, but it would not be ok to install a room for breathing thin air for the exact same reasons and getting the same advantage? Or do you mean it should be some kind of birthright, for only people who were born there? Either you put thin air on the list of illegal substances, or you don't.
It's a natural, physics and biological phenomenon, i see no reason why some people should be allowed to benefit from it, and others not. Maybe training to restrain your breathing should also be prohibited? Because it is basically the same thing.
PS: What might be worth considering, is to limit the allowed artificial altitude of a tent/room to the altitude that is realistic to live at in reality. Meaning no experimenting insane altitudes, like Ganna and Campenaerts have done. But i fear that would be very difficult to regulate and verify.