I've seen this time and time again where someone who was just under the threshold to be cut off, would intentionally not work extra hours, or try for a raise be

I've seen this time and time again where someone who was just under the threshold to be cut off, would intentionally not work extra hours, or try for a raise because unless they doubled their income, they end up losing a lot more money than the free benefits make up. If you make 20k a year, and the cutoff for benefits is 22k, the second you make $22,001 you lose all benefits and are left to fend for yourself. There should be a better sliding scale to assist those who do want to better themselves without de-incentivizing them to do better because of the fear of losing everything.