Phosphates contribute to eutrophication when they are released into bodies of water. Eutrophication can lead to a lack of oxygen in the water, causing harm to fish and other aquatic life. Excess phosphates can also disrupt the balance of nutrients in the soil and cause changes to the food web. Banning the use of phosphates in dishwashing detergents can help to protect the environment and the biotic factors that depend on it.
I hope this helped!
~~~Harsha~~~