This does not appear to be true if you read the earlier "Activation" section. If you have an existing subscription, it pauses while the free period is active. After that free period, your existing subscription resumes. As I read it, there is no "auto-subscribe" after the free period ends -- you just revert back to whatever you had before (or nothing, if you weren't a subscriber before).

If I'm reading it wrong, let me know.