When it comes to apps, Android leads the pack with nearly 3 million apps in its official Google Play store. The sheer volume also means that sometimes iffy apps slip through the cracks. Researchers at the International Digital Accountability Council (IDAC), a nonprofit watchdog based out of Boston, found that a trio of popular and seemingly innocent-looking apps aimed at younger users were recently found to be violating Google’s data collection policies, potentially accessing users’ Android ID and AAID (Android Advertising ID) numbers, with the data leakage potentially connected to the apps being built using SDKs from Unity, Umeng and Appodeal. Collectively, the apps had more than 20 million downloads between them. The three apps in question — Princess Salon, Number Coloring and Cats & Cosplay — have now been removed from the Google Play app store, as you can see in the links above.