Google has removed about 600 applications due to the non-compliance of terms and conditions on advertisements. These applications have been accused of giving out advertisement in a way which created hindrances to users.
Advertisements which come up in an unexpected fashion are deemed to be advertisements which are hindrances to users. These advertisements come up interrupting the user who is using his phone. The Google blog post mentions many of these apps displaying advertisements when the phone is being unlocked and even interrupting phone calls.Google used machine learning technology to find out applications which showed such advertisements. The majority of the removed applications are from China, Hong Kong, Singapore and India. The removed applications together comprised almost 45 crore downloads.
45 of the removed applications are owned by a developer company called cheetah mobile of China. Cheetah mobile has an earlier history of their applications being removed.