So that no one can extort him in private. Same happened with Bezos when his phone was hacked. He was the one who came forward to speak about what was shared by his phone.
If I remember, the perpetrators were determined to be the Saudis. I don't remember the reason, but they had an axe to grind.
I never got to (or wanted to) see the images, but, by all reports, he ... er ... had nothing to be ashamed of.
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