> Why is the answer to anything related to women's bodies always to propose controlling what women do with their bodies?

Strictly speaking, this would fall under the umbrella of controlling what everyone does with their bodies.

A close parallel to disallowing surrogacy is the fact that it's illegal to sell organs. Why should we prevent someone from selling a valuable, redundant organ like a kidney or a lung? The obvious reason is the same as the one used by European countries with regards to surrogacy: because it inevitably leads to the exploitation of the poor.

If anything, I'm a bit surprised the US disallows organ sales (see 42 USC 274e: https://www.law.cornell.edu/uscode/text/42/274e) while still allowing surrogacy contracts in most states.