They do buy mosquito nets, although it's unclear that all malaria net charities do so in culturally-appropriate ways where they'll be used as intended. I believe they've stopped with the large grants to deworming charities, which is good, because the effectiveness of deworming programs is extremely controversial. Depending on where you direct your money at that parent website, it might go to EA Funds, who send a lot of money at global development but has also paid a ton of salaries for people researching LLMs and AI. Or it could go to EffectiveVentures, which might have spent your money buying a castle. For reasons.

If you support mosquito nets, you can give to the mosquito net charity directly, cut out the overhead. Doctors Without Borders / Médecins Sans Frontières does good global development work if you don't mind giving to a huge organization that by necessity has higher overhead. Avoid the Red Cross and you should be fine.