I've spent the past 8 years focused on this theme, more or less, because my conclusion after finding things like internet on a box (and various similar projects) was that they offer
too much information (and also present it in a useless manner).
I've lived in many deeply impoverished communities, and they don't need a full version of Wikipedia, or a medical encyclopedia. They need to know how to easily and cheaply implement basic sanitation and hygiene, basic first aid and nutrition, efficient sustainable cooking and agricultural practices etc... Plenty of effort was spent on that stuff in the Appropriate Technology movement, but all I ever see from it all is wiki articles or 70 page pdfs (which many can't even read, even even if they were in their native language). No one is learning anything from those resources.
I brought this up with some orgs similar to IIAB, and they were just bewildered. So, I made it my life's work to address this in a genuinely useful, accessible, practical way. Hopefully I'll be able to share something in the next year or two...
This, of course, is not to say that they don't have the current or future potential to learn these things, let alone that such info should be withheld. But it's just a matter of practicality of time, resources, efficacy etc. If they can get out of extreme poverty - which many basic things can very much help with - maybe they'll have more time, health and money to pursue academic education, etc
The proof of this, of course, is that we have access to all of humanity's knowledge, and have self-evidently done very little with it.