zlacker

Not a bad idea! It sounds pretty similar to k-anonymity [1], which is not a terrible privacy heuristic. But it does have some specific weaknesses. Wikipedia has a good description.

> Homogeneity Attack: This attack leverages the case where all the values for a sensitive value within a set of k records are identical. In such cases, even though the data has been k-anonymized, the sensitive value for the set of k records may be exactly predicted.

> Background Knowledge Attack: This attack leverages an association between one or more quasi-identifier attributes with the sensitive attribute to reduce the set of possible values for the sensitive attribute.

Optimal k-anonymization is also computationally hard [2].

[1] https://en.wikipedia.org/wiki/K-anonymity

[2] https://dl.acm.org/citation.cfm?id=1055591