Agreed, these laws are more like anti-trust laws. Free market economics, according to its primary academic proponents (academic economists) is not the same as, nor is it even consistent with, the government enforcing arbitrary contracts.
I've observed that said economists don't fight to unchain their institutions for the overbearing tenure arrangements that restrict the free trade of professorships.
After all, wouldn't the university operate more efficiently with underpaid adjuncts?
Tenure if a contract between the employee and the university. It says nothing about the university's or the employee's relation to a third party. You're just going for a cheap shot by bringing up an unrelated gripe.