Also, what if you are a data scientist? Yes, you could encrypt User IDs. However, when even publicly anonymized datasets can be reverse engineered, surely, a pe

Also, what if you are a data scientist? Yes, you could encrypt User IDs. However, when even publicly anonymized datasets can be reverse engineered, surely, a person in charge of feature selection and access to company datasets could wreak havoc even under the restriction? I am specifically curious how Facebook/Google/NFLX which are companies with massive datascience teams handle this.