My point is that packaging the app in such a way as to put off your target audience is inherently unsustainable business.

I agree with that criticism, and I'd encourage the dev to iterate on non-micro-transaction monetization schemes. The part I disagree with is that a profit motive is antithetical to helping kids.

It'd be nice if we had robust, no-strings attached funding streams to make this kind of content, but we don't, so if we want it to exist, consumers need to pay for it.