Could someone eli5 this to me? It seems to me that a cohortised approach is intrinsically better for privacy as a whole as you don't care about individuals but

Could someone eli5 this to me? It seems to me that a cohortised approach is intrinsically better for privacy as a whole as you don't care about individuals but rather a group of individuals with similar interests. If this standard is not abused / de-anonymised then surely this approach is a good thing?