Do that to a gym and they'll sue you for not paying out your contract.
You don't have such contracts with recurring payment products.
For example, Planet Fitness has “no commitment” memberships, but you still have to explicitly cancel.
> You may cancel according to our policy: Per the agreement, in order to cancel a membership, one must either go to your home club in person to fill out a cancellation form, or send a letter (preferably via certified mail) to the club, requesting cancellation. Please note: Memberships cannot be cancelled via fax, phone, or email.
https://www.reddit.com/r/personalfinance/comments/51m0e0/com...