While gift cards and vouchers are purchased in blocks for you to use. Some services provided by this website are purchased using subscriptions.
The loyalty gift card program, loyalty points account, and messaging are all provided by purchasing subscriptions. This is representative of the nature of the different services offered by this site. The subscription services are always charged on a monthly subscription.
There is an auto renew feature that you get signed up for when you first purchase a subscription. You can turn it off however in the manage subscriptions screen and even cancel a subscription there also.