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What is the big issue? Is the data not anonymized?

The data is never truly "anonymized" since companies can easily de-anonymize data in minutes if not seconds as proven time and time again.

Sure but what exactly is a malicious scenario in this case? That they'd use this data to probe which drug to do R&D on?

If this was an insurance company I wouldn't have asked this question.

Until they have a leak or a breach… Don’t trust these companies blindly..