Earlier quoted context omitted.
New York Times does this also. As far as I can tell it's literally impossible to cancel a subscription. I had to close the card attached to my account.
They way to do this is to run the subscription though something like Google Play. Then you cancel it on Google's side. Be wary if a company avoids Google. For example Tinder started forcing users to subscribe directly instead of using Google. This is because most people cancel almost immediately since once you subscribe you find all your matches are bots. The entire purpose is to make it just hard enough so you think…
First-party trials annoy me since cancelation is instant, unlike trials from third-party apps (those cancel after the trial period if you cancel during). Fortunately, you can go to Report A Problem and just say you didn't mean to have the subscription charged and they'll refund it as long as it's a few days from the charge date.