Here are some things you can do to improve the quality of your leads and prevent cheating:
Entry method (edit in the settings tab)
- make sure you enable the confirmation email.
- require people to confirm their email before they can earn points.
- only award referral points once the referee has confirmed their email.
Bonus Actions (edit in bonus action creation step)
- use the manual review (you can bulk approve these but the warning message makes people actually complete the action).