" More than half of the people who subscribe to the service are still subscribers after two years, which is unusually high for a subscription service."

In other words, nearly half of the people who get tricked into subscribing cancel?

Let's also not forget that this will typically be on a credit card - many consumers do not examine their statements closely and will just continue forking over minimum payment. (Of course we won't forget it - it's part of the business model, after all.)