I’ve had my identity stolen multiple times over the years and had everything from fraudulent tax returns filed to get refunds, to credit cards taken out in my name. I was one of the victims of the federal governments Office of Personnel Management data breach 10 years ago (think the HR department for the entire US Federal Government). That resulted in me getting what amounts to free ID/credit monitoring with a really good company for the rest of my life. They send me alerts similar to this one fairly often, and it’s also next to useless. My guess is it’s based on lists of usernames & passwords stolen from websites and offered for sale by scammers. It’s not uncommon for those types of lists to have been collected from multiple websites, and merged into one giant list since lots of people still use the same password everywhere. So there’s likely no way of knowing what website a given set of credentials came from.

As for the masking of the email address, seeing that different monitoring services are doing the same exact thing it makes me wonder if either these are all coming from the same third party service, or if there’s some sort of law/regulation that is requiring them to mask it…