Not limited to exactly 12 months, like our competitor's promotion.

Were you expecting a massive evil corporation to keep spending $50 every month on you forever?

Conditionally

If you have it, it'll always be free.

I would think that it means they have an offering that you won't be charged for, not that they will offer the exact same thing perpetually. Like Red Robin has free refills on many sides doesn't mean that those sides will be something they serve forever.