I'm glad we now have a name for this. If I may take a stab at a more formal, reusable definition of the Fuck You pattern:
A UI pattern whereby content a user wants is provided, then yanked away before it can be consumed, to be replaced by a demand for something the site wants (log in, sign up, subscribe, pay, etc). It's distinct from merely providing a limited amount of content in the first place, as when a site offers 3 articles for free before requiring payment.