I love/hate this one. The anti-vaccine movement combines pseudoscientific drivel with public harm. Could a $1 million anti-net organization reverse far more than $1 million of the Gate's foundations resources in this top effective altruism area?

But I don't know if there's fertile ground for such a concept. Is there any nascent suspicion and skepticism or nets the way there is for vaccines?

A very strong contender for the crown!