The Information Center wasn't completely illegal, nor was it entirely legal. It toed the line; they could get in trouble, but not too much. Just like those loan sharks who operated with unjust interest rates but stayed afloat because they were upfront about their terms. They're the types who found holes in the system and used it to get away from trouble.
Moreover, these information centers mostly focused on the personal lives of upper-class individuals; they were essentially the paparazzi of the rich. At least, that's how this particular information ring began or was supposed to be.