Hi! You didn't have to dig through the reviews to see that this was a subscription. Penguin labels it as such:
"Screen Test by Judah Gabriel (Annual Membership)"
They also include an explanation paragraph at the top of the page in green:
"This is a subscription product. After you subscribe you'll receive each new installment as soon as it comes out and billed every year."
As you can see, this is an annual membership. It's $19.95 per year. There is no monthly option. After a year, if you want to continue to use the technology required you can renew, or you can discontinue the subscription.