If you lose enough of your faculties to tell someone to stop billing your account, I think it is pretty safe to assume that whatever credit card you use to sign up will cease to function once your inability to pay the bill catches up to it... (and assuming the severity of your injuries is preventing you from firing off a one liner to billing@hitechcreations.com, I imagine $14.99/month would be rather inconsequential).
In FACT... I bet if you asked them up front... say "Hey, if I am chewed down to just my torso by an alligator or honey badger, and am unable to cancel my account, could my next of kin eventually ask for a reimbursement after providing photographic evidence of said event?" they might just take you up on that.