Is there a reputable non-profit I can donate to that provides this treatment? The idea that $3 is unaffordable for so many is so sad. I would gladly provide for a number of people to be treated if I could trust the money goes to them.
This fund goes to GiveWell's top charities, unless there's something that the fund managers think could do better in expectation. (For context, the EA Meta fund went towards founding GiveWell and https://80000hours.org/; they know what they're doing.) If you're too lazy to keep track of GiveWell's top charities at any given time, or want to contribute to medium-risk high-reward causes too, that's a good place to put your money.