Apparently not.
Fixed expence, no benefits paid, and easily discarded.
I wouldn't hire a person who won't use the spell-check in the posting box.
Unlike temp agencies, most craft unions currently take responsibility for training for specialized skills: electricians, mechanics, millwrights, high steel workers, telecom workers, bricklayers, air traffic controllers, etc. Unfortunately, most often they contract by a fixed rate of production under the premise that all their workers are equally skilled, which means that they don't make the most of their people and don't get rid of the worst. Nor do they have as much motive to improve the skills they deliver as they would under competition.
Besides the skill level and the variety of services offered, the difference between most "temp agencies" and competing craft "unions" is that the latter would at least start out employee-owned. As to "temp work" many of the jobs for the above skills above are not.
Try again.
So your grand scheme is to resurrect the ancient “guild workers” !
Shall we also revamp indentured servants? ROTFLMAO!