Satellite internet will probably severely damage the ozone layer.
The worst about it?
The damage is not now, but it will take decades before it starts.
But: First things first!
What is the ozone layer?
The ozone layer is located in the lower stratosphere (15-35km above ground), where the concentration of ozone (O₃) is highest. This layer shields us from most of, otherwise deadly, UV radiation from the sun.