These parasites falsely claim to have recruited and screened workers for the same job the workers already hold. Worker morale and efficiency is also a victim here. I'm aware of only a few articles, in trade journals, which describe details of this scam. But even those million or more workers directly threatened by it have not added any anecdotes or voiced unanimity to help stop it. You haven't heard about it from news media, who earn income from political advertising.
Concern shown by some, for political campaign funding reform, is encouraging.
But far broader exposure of specific abuses is needed, before reform can be expected. Too many large corporations depend on lobbyists and advertising to divert attention and escape responsibility for negative aspects of their products. But an enlightened public is not fooled indefinitely by these schemes. So environmental cost, hazards associated with the product, later cost borne by buyers, and other societal costs, must ultimately be factored into product cost. They are usually not factored into product cost by manufacturers and sellers, until they are hit by costly lawsuits.