[suizi]

There have certainly been busts in the media, including some depraved individuals who have blackmailed teenagers into sending them images, one of which set the dangerous precedent of tech companies developing exploits, and refusing to disclose them after the fact.

It isn't terribly surprising that a platform like Facebook, which has a lot of children on it, would end up attracting predators who seek to prey on them. Fortunately, Facebook has been deploying a number of tools to improve their safety over the past few years which don't rely on surveillance or even censorship.

Statistically, there have been a number of arrests which have been a product of their activities, although I don't have much info on those. Someone else may.

The real question is whether it is worth sacrificing everyone's privacy, so that a few people can be arrested.

I can imagine iCloud being a lower risk platform than Facebook. Someone can't really groom someone into uploading photos, although the existence of such images is still very condemnable.