So it really depends on the business and how much information they have about you, and if they are dirty enough to send you to collections for it.
A gym is likely going to send you to collections. An online SaaS is more likely to just cut you off and cancel the account.
Can't you Americans just send a certified letter informing a business of your intent to cancel and asking them to send you a final bill (if any) to settle payments within a specified time limit? That should cover you legally?
Or are you always reading all the terms and conditions print on all the software you install?
If so... that could make it worthwhile. :)
never sign up for a gym that needs your ssn. red flag.
In my home country we've had a national system for electronic invoices for ~10 years which allows you to receive invoices to your bank account. You can remove any such entry at any point in time. You also see all scheduled payments ahead of time and need to sign them before the due date, using a 2fa system that isn't tied to the bank itself. It's not perfect, and even feels a little aged today, but it's so much better than here in the US.
I’ve had it happen a couple of times. It’s a minor inconvenience to switch over any subscriptions to a new card, but it has never cost me a penny.
The only way to do it is as a chargeback but chargebacks are after the charge and come with a whole mess of pre-requirements as well as if you do it too often your provider will kick you off.
EDIT: Fit4Less is southern Ontario
Sweet were the times, when they "tried", and when customers were not forgiving.
That's not to say that asking your bank to block Merchant X isn't useful, but the bank can't guarantee that the merchant won't be able charge you again via a different payment processor/etc., and is why some banks are hesitant to offer this functionality.