It's actually an amazing way of being hostile towards said service. - Using up their resources, for free, while looking like one of their clients - Not displa

It's actually an amazing way of being hostile towards said service. - Using up their resources, for free, while looking like one of their clients - Not displaying any of their ads, costing them even more - If they want to stop this, they have to dedicate resources to do so, which costs them money. - Stopping this most likely means making their own app worse, leading to a worse experience, leading to fewer users and therefore, costing them money.