My original comment wasn't about BIA specifically. Frankly, I have absolutely
no idea if it's a good system or not.
It was about the dogmatic preaching of people that "privatization" is inherently evil.
In terms of Gates and Zuckerberg, I obviously can't offer you concrete proof. But I can ask you to seriously reconsider about the motives you ascribe to people. That investing in third world schools would be their best investment option (ignoring altruistic intentions) defies belief. Especially when they both have directly donated hundreds of millions of dollars to schools.
I am fairly confident that Gates and Zuckerberg are in this to lose money. They both have more money than they could ever do and have signed pledges to donate the majority of their fortunes before their death.
What seems more likely?
A. Billionaire philanthropists (who have donated millions to education already) invest in a small chain of private schools in order to fool millions of poor children and to enrich themselves.
B. Billionaire philanthropists are interested in improving education around the world and have donated millions of dollars to that cause, including to some for-profit ventures.