Is that in the article? It's paywalled, and I can't find other mentions of that.
I've assumed that the suit is over the fact that Meta intentionally and algorithmically seeks to test what content gets you to stay on their site and feed you more of that.
I also don't remember the last time I saw a Next button on Instagram or Facebook. Maybe they have one for children? But if they're still proactively encouraging addictive behaviors, I'm not sure the specific UI element matters as much.
Whether we're regulating UI elements or a recommendation algorithm... It's one thing to say they're "encouraging addictive behaviors", but what's a rule that identifies what what part of a mobile app needs to change? It's an unproductive path.
How do we differentiate "addictive" behaviors from "non-addictive"? Is it illegal if people like your product too much? There isn't a clear definition here of where free will comes into play.
By regulating the existence of a 'next page' button? Curious if you can think of user interface rules that are less absurd.