Only because it isn't worth it for the company to go after you. If they want to fight you a canceled credit card is not a unsubscribe notice and they are likely to win in court.
However if you try to unsubscribe and discover it is too difficult calling the credit card companies and ask them to stop payment can get attention - credit cards companies have consumer protection and they can make things difficult for those making unsubscribe difficult.
I generally use the Apple app store on my phone if anything requires a subscription, even if I usually use the service on some other device. It just makes it way easier to see which subscriptions are still in effect, and lets you cancel them with one click. I hate Apple's billing monopoly shenanigans in general, but this one case where it actually benefits the end-user.
