That doesn't prevent the following scenario: * play the game in an airplane mode * switch to another activity and turn on the internet * game prefetches an a

That doesn't prevent the following scenario: * play the game in an airplane mode * switch to another activity and turn on the internet * game prefetches an ad or even several while in the background So next time you launch the game you'd have to see those cached ads. It's definitely better than having the game fetch and shove them in your face all the time, but still it isn't a complete solution in this case.