In Turkey, you can cancel any subscription you have through the governments app called "e-Devlet" which stands for "e-Government". It is an awesome system, a service making it hell to unsubscribe? Just cancel it through e-Devlet and if they don't cancel your subscription, you can sue them. Though I think it only works for Turkey based companies, sadly.
This seems like a great solution -- allow a centralized party to control the front end (and create an audit log), then transmit the intent to the service to act on. I'd prefer to see it as a non-government, not-for-profit service. But the ceding of front end control to services themselves doesn't work. We already learned that with email / unsubscribe.
Either way, my initial reaction to this is great, now we can prank other people by canceling their subscriptions.