'Data is a fingerprint': why you aren't as anonymous as you think online So-called ‘anonymous’ data can be easily used to identify everything from our medical records to purchase histories July 13, 2018 https://www.theguardian.com/world/2...rowsing-data-medical-records-identity-privacy
I wouldn't be surprised if some big IT company deletes PII from from it's databases after i.e. account deletion, but soon after that upload that data to some outsourced or in-house team to re-identify people based on data.