No one will ever be in danger of accidently cancelling everything. The system will be intentionally designed so that you can only cancel one thing at a time, and that will be obtuse as possible. There will be a great risk of thinking you've cancelled something when it hasn't been cancelled, which will only be resolved by calling customer service.

You'll go through six to eight pages to cancel each item, and when you've done that you'll get a confirmation email that will require you to click on something, log in, and confirm the changes for them to actually apply to your account. If you get the confirmation email and do nothing, your changes will not save.

There will be a slew of angry customers calling customer service, who's job it will be to give back as little money as possible and retain every customer that calls. That job will be so awful that someone working that job will commit suicide because of it. The cable company will see that and market it as a success to their shareholders, and as an "easy cancel anytime" in advertising.