Becuase they are not trying to eradicate every single mosquito. They are targeting the worst of the worst species such as the Anopheles, Aedea, and Culex.

Those species are driving native species extinct and causing tenfold ecological and transmission damage due to their aggressive invasive nature. That’s why they’ve been marked for extermination.

I also assure you that the disruption to their ecological niches will be minimal. They fill no niche that isn’t fulfilled by other species, and they play little to no role in the food chain.