It does not have to be perfect. The children who are likely to play with this have different standards than rich kids expecting to be professionals. As long as it can take the wear and tear, it's just fine.
Couple that frustration with the fact that regulation balls are common and cheaper, and I don't think you'll find these popular at all in practice.
I'd like to be wrong about that; it would be great if it worked out. I just don't think there's much chance of it going anywhere in reality. Any money behind this would be better spent on distributing small solar panels and batteries to serve the same purpose.