[LDale]

They are strong education tools, no doubt - but note that each of them is a support technology for traditional education, not a replacement for it. These success stories could not succeed (or usefully exist) without a well established traditional education system.

These are also not the sort of tools the article here is discussing (which instead posits that the future of education will be the replacement of traditional flesh-and-blood education with digital education platforms - which will fail).