Avoid fraudulent multiple account creation: using the same existing-account-detection functionality outlined above, you can stop users from creating multiple accounts to exploit your app, such as signup bonus abuse and free trial abuse
Permaban bad actors: while you can easily ban individual bad actor accounts by changing their account profiles / access rights, those same individuals can simply create new accounts and sockpuppets. Keyri fingerprinting utilities can help you ensure that, for this group of users, creating a new account is more difficult than simply providing new credentials, such as a different email address, phone number, or a fresh re-installation of your app. Regardless of what new credentials or account identifiers these bad actors input while registering a new account, Keyri utilities will inform you that they have already created at least one account before.
Read on for details on implementing: