[Supermancho]

> Market power is irrevelant to workers being able to fetch the market rate for their labor.

If the market consists of few actors, you get collusion to depress wages and opportunity (in tech you had https://pando.com/2014/03/22/revealed-apple-and-googles-wage...) but it exists across a number of industries. Your assertion assumes only good actors, which is not commensurate with reality.

[CryptoPunk]

Collusion of this type has a very minor impact on market rates. The example you cite is tech companies coming to an agreement to not cold call each other's employees to head hunt them. And wages in Silicon Valley have exploded over the last couple of decades so obviously there are much larger forces at play in setting wages than these collusions.

This sort of collusion can also be addressed in a much more targeted way than creating laws that give workers who unionize control over major hiring decisions of their employer.