I think what they're referring to is the global increase in light pollution they cause. This article goes over the consequences for both astronomy and the broad

I think what they're referring to is the global increase in light pollution they cause. This article goes over the consequences for both astronomy and the broader human experience if you're interested. https://www.nature.com/articles/s41550-023-01904-2 https://www.nature.com/articles/s41550-023-01904-2