I suspect they also cannot compete (on price) with Air Carïbe also flying to Punta Cana from Paris.
I dont think they would even try to compete on price, tbh.
Whatever may be said on dr1, the DR still attracts mainly low-cost tourists.
Even on regular routes --- like Madrid/SD--- the plane configurations are 💩💩 and old. They cram as many people as possible in them.
Buisness tickets are so not worth it to and from the DR.
I see ( well saw, as I have given up going through the US ) the difference, on the same company ( be it AirFrance, BA, Iberia and their respective alliances ) doing Europe/US/DR compared to Europe/DR. The plane configurations are years ahead.
And the crazy part is if you are organized and get your tickets well in advance, its cheaper to go through the US.