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Because it’s illegal to solicit prostitution in most countries. The other common illegal content was scat. That was the point of the exposé, to highlight that they were allowing illegal users making illegal content on their platform to get away with warnings - I mean, how can you merely warn someone who is underage that they should stop posting underage content?!
Fair enough, though it does still seem a bit odd to list prostitution in particular. Whats the joke? If you fuck while recording it it aint prostitution.