The Jadettes and every other one of those accounts represent hundreds of dollars in revenue for SE. They never say anything, they just stand there, so they will probably never be banned.

They are, in fact, manually controlled. I once had the Lalafells appear one at a time around my own Lala on Lamia, because she was a 1.0 character doing the hulu and they started dancing around here. Spontaneous, and very cute.