Fortune telling is fake.
The fortune teller pretends to divine things about you through omens or magic, but in reality they only tell you the things they already know or have guessed. Eg, if they notice a wedding band in your ring finger, they may start talking about your marriage and your spouse, and then go on from there by fishing tidbits of info in your reactions and replies.
Why did I mention this? Cause this chapter offers a good example. Hino pretends to read Koguma's palms, and then tells her: "Hm, yeah, I see in these lines that you are... a total masochist!"
ROTFLMAO x 10000
Talk about some divination.
Thank goodness Koguma didn't pay money for that...