Not good news, it's just better to know, than to not know. These sponges don't take chemicals out of our environment, they trap it and slowly release it where we would need cleanness. These chemicals would have gone away a long time ago, but the sponges kept them there.

Additionally why this is not good news, these materials were not supposed to be sponges to begin with. So, it's like discovering a bad side effect. Again, better to know than to not know, but it's not what one would call good news.