Better, in my opinion, is a clear and easy way to "uncancel" if you accidentally cancel. But even that can be abused: "Here's a button that looks like a confirmation, but actually it's a resubscribe button." It's just too tempting to make that "number of people who resubscribed after cancelling" number a target. You think you're reminding the customer of their mistake, but really you're just optimizing the dark pattern.