Untrue.

https://www.britannica.com/story/what-purposes-do-mosquitoes-serve-in-ecosystems

https://blog.nwf.org/2020/09/what-purpose-do-mosquitoes-serve/

https://www.mosquitoreviews.com/learn/mosquitoes-pollination

There’s different species that serve different purposes in the ecosystem.

https://www.lukerchocolate.com/en/innovation/meet-the-mosquito-behind-cocoa-tree-pollination/

https://www.nps.gov/articles/chocolate-midge.htm

All that being said, I can’t stand them lol