The criticisms here remind me of a quotation that I'll paraphrase: "in silicon valley there's a million apps to order a coffee, but not one to teach you to read".

People seem to have the basic premise: why not just get an educated adult, or good teacher, or personal human tutor for the kids which is so much better?

Well there's a billion parents who cannot ever afford that...

So I'd just like to note that HN is absolutely 100% not the kind of community that you need to impress or sell to. Best of luck.