With the loyalty enrollment defaulted to ON, the guest can enter a password and their birthday during the checkout process to enroll. This leads to a much higher percentage of guests participating in the loyalty program.
To check this setting, navigate in Thrive Online Admin to Set Up > Communications. At the bottom of the screen, check the box that says "Default Guest Loyalty Sign up at Check Out."
Click on Publish, and Publish all stores.
Your online experience will look like this with the enrollment defaulted to YES: