I’m seeing some domain_userids shared by different user_ids in my DB. (one domain_userid is even shared by 150+ user_ids.)
As I looked for other posts, it appears to me that domain_userid is the first party cookie id and as UUID, and it is already the best candidate for identifying unique users. In my understanding(correct me if i’m wrong), it has also something to do with a customer’s device? if that’s the case, how can a device shared by so many different users?
Moreover, they all seem to be in different cities, and with very dynamic customer data. Some of the users were created in 2015 and 2016 and still active in 2021. I was able to link some users by their IP addresses, but it still doesn’t make up for 150+ users.
Since I’m working on anomaly detection, I know this is quite unusual and these cases are the outliers in my analysis. However, I’d still like to know what could be the reasons behind this. Is it possible that it can be stolen or misused somehow?
Thanks in advance!