I know that quote is not yours, but it is the claim we are discussing and that you are defending.
> I avoid the term "worth" for precisely that reason: that it tends to trigger by equivocation and thus sidetrack
You're the only one engaged in side tracking.
> that sounds like you being triggered at the colloquial use of "worth" for what a person can get paid on the job market, because you conflate that by equivocation with some philosophical, emotional or moral notion of personal "worth"
Nope.
> The job market is not at all about what people are "worth" in those senses but only about what "market worth" not they as persons but their work time has, i.e. for what value they can expect to find someone else who will be consenting to give their money in exchange for that work time.
Yep.
Except, markets are never perfect. It is not unusual that individuals who can produce a lot of value for companies can struggle to find employment that provides commensurate pay. The reasons for this are diverse. One example is the explicite collusion that Google engaged in. Other examples are Cargo cult disfunctional hiring practices, ageism, racism, sexism, elitism, nepotism, ...etc the list goes on and on.
My whole point is that "What people are worth and what they can get paid are not synonymous".
Edit: In this specific case, a major factor is the bargaining issues that arise with "joint employment". The associated ruling allows workers to bargain more directly with the entity for whom they are producing value.