I wonder if instead of stiffing their contractors, customers will instead be the ones getting stiffed by unscrupulous contractors. I.e., contractors over-billing: "If you don't pay the amount I'm demanding, I'll report you." Companies might indeed pay the bill rather than risk a fine, but at the same time, they might become much more reluctant to hire contractors at all.

I worry that this kind of well-intentioned law will in fact reduce opportunities for free-lance people, in favor of consulting agencies.