'we're sorry, here's a month of Playstation Plus... oh and by the way anything you download for free that's exclusive to Plus subscribers you lose access to unless you keep subscribing.'
This will basically end up being the biggest marketing push for Playstation Plus since it launched.
What's worse, that in order to sign up for the free month, you'll probably have to give Sony a credit card number which they'll continue to charge at the monthly service fee rate after the free month until you jump through a bunch of hoops to cancel.