Also, none of my artist friends would say that they were being "taking advantage of". I have no idea why you'd try to connect the situation I've described in the US art world to communist dictators, other to make some facile point that isn't relevant or even correct.

If you think that Bezos was motivated to create amazon because the taxes were just-so, you're delusional.

There are numerous books on this topic. Obviously not everyone agrees with them, but Alfie Kohn's "Punished by Rewards" is an excellent starting point for reading about what we know about the connections between motivation, creativity and rewards.