So ya'll remember the "Fappening"? It was said that a number of celebrities iCloud accounts were hacked.
To me it doesn't seem probable that so many people would fall trap to that type of scheme. Especially since they're all celebrities.

However, I would suggest that celebrity pervert extraordinaire, Harvey Weinstein, could have potentially saved those pictures to his iCloud, and had his account hacked.

The Fappening is just Harvey's personal iCloud collection from actresses he coerced.

That's my theory.