Yeah, Zuck is really being a bit of d** there. You can't spend decades hiring the best engineers in the world and give them millions of dollars worth of resources with the sole aim of creating products specifically designed to retain attention and then simply shrug and say "if you don't like it, leave it". That's just not a fair fight.
Is designing for retention bad then? God forbid you write a story that captivates readers; if they don't stop reading after a few chapters, why, that's illegal mate
Lol, so then cigarette makers weren't deliberately modifying drug levels in their product to addict smokers, they were "designing for retention".
More to the point, though, your comments here are all straw men. This was specifically a case about targeting children with addictive features of their products.