That used to be the default, but CCP decided (like so many businesses) 3-4 years ago that the default should be the opposite and it’s our responsibility to cancel the subscription that we have to agree to sign up to when we purchase a subscription with money.
as soon as you pay for a month, go to the account management screen and stop rechargable billing you still get your game time and it wont rebill unless you want it to, thats how i do it.