Why does F-Secure Identity Theft Checker show different result than other 3rd party vendors?

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I compared the results between F-Secure Identity Theft Checker and Have I Been Pwned. Why is the end results are very different?


Each vendor has varying methods in collecting and recovering breached data and leaks. One vendor may communicate a specific breach and associated breached information differently when compared to another vendor. There are events where F-Secure recovered specific breach data gets categorized differently than what other vendor is categorizing them.

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