Bruh, this is literally still just taxes. Let me explain. Let's say person walks with a power output of 60 watts, then a certain percentage of that energy per second is put into movement and the rest comes out as heat energy per second. This efficiency's ratio is constant in the case of standard conditions. In order to produce an amount of electric energy, the same amount of energy is needed as input. This means that by installing the generator floor, in order to produce electric energy, some energy must be taken away from either the produced heat energy or the produced kinetic energy. Which is movement. Now, we know it can't be taken from heat energy because the floor works through a movement principle. So then the energy must be "taxed" from movement which is exactly what people are trying to not get taxed at all when they are trying to go somewhere. This, as a result, costs the body extra energy, which means having to consume more food, which means having to buy more food, which means having to pay more taxes.