This is key because it’s close to the thing that made me go “ah ha” reading the intro: modern surveillance and algorithmically-managed pricing (so, cheaply modified at arbitrarily-fine resolution based on arbitrarily-many quantifiable factors) open up the possibility of pushing this exact effect from groups of workers to individual workers.
You can avoid (at least to some degree not previously achievable) addressing a pool of workers and instead only clear the rate for a particular worker. No human management input needed per-decision or in any part of the broader offer-decision process and surrounding data gathering and measuring, which is what makes it possible.