Because giving back them the 3K would be a bad example. What if everyone enjoyed the virtual tomatoes they gave to their virtual guests, and then asked for their money back? Or worse: what if everyone made 10 troops in an hour instead of 48 hours and attacked the neighboring village and destroyed it, and THEN asked for their money back? This destroys the fabrics of f2p. /s
edit: Nice that Google refunded. The OP is misleading.
I think the issue is that when a lot of people react to these sorts of stories, they're not really seeing how the situation would actually play out. I mean, if you assume that the scenario was "kid asks for credit card and dimwitteed parent handed it over without a second thought," then yeah, it was a transparently awful idea worthy of derision from the start. But what's far more likely is that the parent did initially resist, was eventually worn down by the persistence children are renowned for, cautiously relented, and then eventually became complacent when everything seemed to be going according to plan.
I'm not saying that excuses it. I'm just saying that I can empathize a bit with how these mistakes happen. And I say that not as someone who has or is planning to give their kid access to a credit card (my kid is three and doesn't understand how credit cards even work yet), I just understand that one is always going to let their guard down in some fashion. I'd rather reserve my derision for more harmful forms of neglect than this. Mind you, this was obviously a bad idea, but hindsight is 20/20.