It is an absolutely horrible way to treat customers. Don't use their service.

I've had a subscription for a while and it has helped me read more books but this cancellation policy is absolutely bonkers. They really are actively trying to hurt and squeeze the customer more than any other service I've used. I downgraded my subscription (to stop receiving credits) but I'm still having trouble using the credits I did build up. As soon as I'm done I'll be cancelling forever.