Can we please stop with the "children who have no PC will be at a disadvantage in the classroom" charade? Computers are great and useful, but we don't need to pretend that they will magically help children do better in school. If anything, the limited evidence available from larger-scale voucher programs suggests that they may very well reduce test scores. Which is rather intuitive. Sure, you can use your computer to do your homework and prepare your next presentation. But you can also use it to play games or go on Facebook and Buzzfeed instead of doing more productive tasks. If you're a child with low impulse control/intrinsic motivation to study, having a PC only means one more source of distraction.
This kind of program appeals to nerds like us because we remember getting our first PC, learning how to use Linux to set up our first home server, learning how to code, spending a lot of time online acquiring new knowledge, etc. That's literally the first paragraph of the article. But we're not the average person. Most children will not do that: ask non-nerds around you how they felt about the time their parents bought their first computer and you'll get a "meh" because, in the pre-internet era, you could easily see them as glorified typewriters if you weren't a nerd. Nowadays, the average child will start playing Flash games on the web and be content. And gaming is much more fun than doing your homework.
I think it's also good to distinguish between "cannot afford a computer" and "does not think a computer is worth the cost". What I mean is, if instead of providing a computer or a voucher that can only be used to buy a computer, charities gave people $200 (enough to buy a Chromebook or Chromebox that's sufficient for all school-related uses), would they go out and buy a PC? Or is it a paternalistic endeavor that insists that poor households REALLY need a PC because WE couldn't live without one, so they must just not know what's good for them? Of course, if you give away something for free, people will take it. That doesn't mean they value it as much as you think they do. I see that they're trying to identify people who really need it, so kudos to them, but it's difficult and, so far, willingness to pay remains to best way to do that. Provided of course that people have enough money to have real options. This is where I start my rant about how charities are at best a stop-gap solution fraught with problems such as the fact that people always start them because they think they know what poor people REALLY need ("a PC", "no, toys", "no, cans of food", etc.). What about: a decent income so they can make their own choices rather than having to rely on handouts?
At least, when it comes to PCs, money is quickly becoming a non-issue. A Pi with case, keyboard, mouse and Wifi dongle can be purchased for perhaps $60-$70. Spend a little more and you can buy a Banana Pi or another cheap Chinese ARM machine. When you factor in the time it takes to check that donated computers still work well, set up the Linux OS, coordinate donations, etc., I'm sure 'free' PCs end up being more expensive.