Final answer:
It is true that non-sensitive columns can endanger user privacy, as combining such data can lead to the re-identification of individuals, known as linkage attacks.
Step-by-step explanation:
The statement that a non-sensitive column can endanger user privacy is true. Even if a column doesn't contain directly sensitive information, when combined with other non-sensitive data, it can lead to the re-identification of individuals. This is known as a linkage attack. For instance, by correlating data from different sources, one might deduce a person's identity even from seemingly innocuous details like their zip code, birth date, and gender. Hence, it is crucial to apply privacy-preserving techniques across all data, not just the obviously sensitive kind