Guinea Worm is literally a parasitic worm. The eradication programme isn't about injecting people with a vaccination, building modern water treatment plants or deploying sophisticated drone technology, it's stuff like:
- Here are some free water filters. Filter the water from that murky pond before you drink it.
- When you have a worm, don't go in the water. Yes it feels cooler, that's because the worm wants you to go to the water, go to a free treatment clinic instead.
- If your neighbour has a worm, go to the clinic, tell them who the neighbour is, you both get cash money and the clinic will treat the worm. Hooray.
The biggest obstacles to Guinea Worm Eradication are not about Africa's lack of technology or its corruption.
The big obstacles are "insecurity" (ie civil wars or just violent criminals who control outlying areas) and "inaccessibility".
Inaccessibility is hard to comprehend for most of us, we're not used to truly being far from civilisation. People who live two days walk from anything resembling a road may have only heard rumours of the existence of the Guinea Worm clinics - for them a parasitic worm chewing its way out of your leg is just a routine hazard of normal rural living.
But yeah, Gates is already investing in the very lowest technology fixes, he isn't some tech nutjob who thinks we're going to solve desperate poverty with a Docker image.