Welcome to Permies, Arman! What a great question!
The damage caused to twigs by cicadas laying eggs in them basically prunes them, thereby stimulating growth. Also detailed in this video, they sometimes serve as a host for a very strange fungus.
They certainly create a beautiful soundscape (at least to my ears). Wonder if that has any effects on their ecosystem?
“Action on behalf of life transforms. Because the relationship between self and the world is reciprocal, it is not a question of first getting enlightened or saved and then acting. As we work to heal the earth, the earth heals us.” ~ Robin Wall Kimmerer