Using mosquitos to deliver Malaria vaccines

Here is a more recent article (since BBC is talking about it today):

https://www.sciencealert.com/promising-new-malaria-vaccine-can-be-injected-by-mosquito-bite

I always thought no good comes from mosquitos, as they are a parasite that is wholly detrimental to other organisms. If that whole specie were to go extinct, I would celebrate. Now I have to reconsider.

I also have to wonder how vegans take this news. It’s a case of humans exploiting non-humans, but AFAICT it’s turning a wholly harmful non-respectable organism into a beneficial one.