Or genomic information, or a unique combination of drug interactions which could be combined into a sort of health fingerprint, or phenotype information, race o

Or genomic information, or a unique combination of drug interactions which could be combined into a sort of health fingerprint, or phenotype information, race or age, which are often necessary to provide medical context for diagnoses, or timestamps on test results that match up with events in your calendar or destinations in your navigation or security camera footage, and I'm sure the list goes on. The word "anonymity" is a little ambigious. It can mean "unable to be identified" or it can mean "namelessness". There's not much information about anyone that is truly unable to be identified, especially when combined with additional pieces of data readily available from external sources. It all depends on who they're sharing the anonymous data with and to what external data do those partners have access.