The difference lies in the fundamental difference between natural law and synthetic human systems. Entropy isn't your master, it's a fact of your own existence.

By contrast, the present economic system is a synthetic construct made by other humans to exploit you, designed with largely that purpose, co-opting your biological needs for coercive power, and doesn't necessarily need to happen.

That's what makes one slavery and the other not.

The difference is so obvious, I actually am confused why you think conflating physics with political norms was appropriate.