Ineffectiveness should be determined by a logical and technical argument over the method, proposed as a possible solution, itself. You should identify what has it go wrong in practice. And you have in part already done it: that taxes are not earmarked (on compensation) and that the discouragement factor is insufficient. That is not necessary, it is not intrinsic to the method.

Nearby I commented on the infernal noise from electric cars. That is not necessary, not intrinsic: it just happens that people think it acceptable that some drive around with loudspeakers transmitting the screams of torture chambers. A potential solution becomes a problem because of external (non intrinsic) factors. It would be much, much easier to fix the external factors of the taxation problem than those of the "broken cybernetics" problem.