If you’re asking how this was ever allowed, it turns out that “marine protected areas” are the supercategory which is only one level up from no protection at all.

there are more than 16,615 MPAs, encompassing 7.2% of the world’s oceans (26,146,645 km2), with less than half of that area – encompassing 2.9% of the world’s oceans – assessed to be fully or highly protected according to the MPA Guide Framework.