There have been multiple mass-deletion events and Google has admitted to at least one of them - the infamous "only 0.02% of our users" incident, for example - b

There have been multiple mass-deletion events and Google has admitted to at least one of them - the infamous "only 0.02% of our users" incident, for example - but only because so many people were affected, the press picked up on it and google's PR firms couldn't keep it quiet.