Additives can leach out of plastics and enter the food chain, but pellets lost at sea are a completely insignificant factor because the total volume of waste produced by this route is so small. The majority of marine plastic is either post-consumer waste dumped in rivers in developing countries, or fishing gear that is lost at sea. If you're really worried about this, then you really need to take it up with the government of the Philippines and the global fishing industry.