"Personal information" is information about you such as your phone number, address, age, photos, bank account number, and so on. People usually want to keep their personal information secret.
You usually express whose personal information you're talking about with "___'s personal information":
But in the example at top, this wouldn't work because the adverb phrase "all kinds of" comes before "customers'". If you tried to use the phrase "all kinds of customers' personal information", it would seem like there was