This disproportionately hurts the poorest people there the most. Groceries are already exorbitantly expensive, doubly so because of this misguided act.
Never mind the fact that Puerto Rico is in the middle of recovering from a Cat1 hurricane that nearly took the island out for a month (power outages still ongoing). While the island should have been prepared for that, it was still in the middle of recovering from Maria (a cat 5 hurricane in 2017).
How much slower has relief been because of the jones act? How much longer can we keep subjecting people to colonialism?