A lava lamps that just produces randomness, ie for cryptology purposes, is different than the benefit here, which is to produce specific randomness at low energy-cost

It proves the point it mesmerizes the audience.

One can create a true random generator algorithm by plugging a moving computer mouse to its input.

Would be easy to put a dozen cages with mouse wheels on in them, real mammals in there, to generate a lot of random numbers, everyone would understand so only funny, they want mysterious!