Those are private airports (open to the public). Maybe they offered (Grupo Punta Cana and Central Romana) to pay part of the cost to expedite it. Cibao is privately owned but currently going through an expensive expansion that they will 100% pay.Not only PUJ, La Romana too. Maybe starting where there are less “offenders”? I’d bet Puerto Plata and Santo Domingo have more overstayers. Not sure about Santiago.
Santo Domingo and Puerto Plata are government owned, though Vinci Airports is responsible for doing their upgrades. Since the government owns them, whatever Vinci decides or is told to do requires approval from Congress. That can take a while. PC and LR don't need approval from Congress, they just need approval from their respective private companies boards and/or their main shareholders.