We have tried to make it as hard as possible for people to game your referral program. The suspicious user's notification in your Users tab will appear when our system detects any users that may not be legitimate.
What makes a user suspicious?
Users will be flagged as suspicious if they register from the same IP address as another user, or if they use a + symbol in their email address, or if they try to register with an email address of a user that is already registered.
Click on the Suspicious Users button and a list of users that we have flagged as suspicious will populate.
From here, you can click on the drop-down in the Actions column and choose to accept or delete the user.