This is DMCA. DMCA does not absolve hosts if they "receive a financial benefit directly attributable to the infringing activity". So if google hosts an app and

This is DMCA. DMCA does not absolve hosts if they "receive a financial benefit directly attributable to the infringing activity". So if google hosts an app and makes money off of that app, they can't claim safe harbor if that app is infringing. Hence, under the DMCA, they need to take down the app as soon as they have even a suggestion that it might infringe somebody's copyright, and not put it back up until they are certain it doesn't.