Re: You would think
"It's clearly mentioned this is anonymous data"
You say that as if it's meaningful. Just calling the data "anonymized" is meaningless. Most popular methods of "anonymizing" data is ineffective in the face of Big Data, which often makes deanonymizing data very easy to do. Some forms can be effective (such as only keeping data aggregated with that of large numbers of other people and deleting individual data records), but we don't know if that's what they're doing or not.
If not, then "anonymous data" is effectively a lie.