As much as Hiei hated the little devices, and the fact that it meant anyone could reach out to him at any time (who were not the people he was most concerned about, here) - he did like the ability to stalk a little, here and there. One of his favorite pass-times when he had been kept in the human world was listening to the often foolish conversations of those around where he was napping for the day. Here, he can do that as well as see what is written in plain sight on the network as well.

Would be retain a lot of that information? No, not really. But he wasn't being anything other than nosey in this endeavor.

"That doesn't strike me as my problem." Except where it involves their own people, but even then, with the Jagan he can so conveniently communicate it makes the tablet basically redundant.