I recently subscribed to Barkbox, a dog-toy monthly service. All the bad reviews the company received were about the auto-renew, which was always selected as "on". But the website has a simple and easy way to cancel the subscription, which is what I did. I've signed up for one year and won't be charged after that. Folks don't understand that cancelling the "subscription" means you'll only pay for what you signed up for. You can't cancel your service once you've paid for the set amount of time, but you can at least ensure that you decide whether or not to renew. I bet if you tried hard enough you could even opt out from your designated service and get back the fees for unused months, but that's only a guess.
Photo.net is criminal if they don't allow this.