616K accounts from Reincubate (reincubate.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesNamesPasswords
In October 2020, the app data company Reincubate suffered a data breach which exposed a backup from November 2017 (the newest record in the data appeared several months earlier). The data included over 616k unique email addresses, names and passwords stored as PBKDF2 hashes.
Source: Have I Been Pwned (CC BY 4.0)