They were probably worried that some other employee was making sexually explicit videos, or even worse, videos of child sexual abuse. If that was happening, it might come out eventually. If it came out that the company was also aware that employees were making personal videos, then that's potentially bad PR for them.
Which, to me, is an insane concern. Who wouldn't understand, in the rare instance of such abuse, "we trust our employees to conduct themselves in an appropriate manner. This person misused our trust, etc."
I thought it was insane rather than to deal with issues like that on a case by case basis, they decided to just fire ~ 30 people. But then again, I'm not a corporate muckety-muck, so what do I know.
