This seems really messy. We regulate gambling because it's a specific thing, but how do you differentiate a non-addictive platform vs an addictive platform? (aside from this specific company... I mean in general). How do you "test" whether or not they're inherently addictive? At least in this specific instance, they can look at the blast radius and make a determination. But this feels legally unsatisfying in the gene…
As for Meta itself, and proving their case - I can't imagine it'll be difficult. Whatever they get in discovery + endless testimony from various people that have worked there will already likely leave it beyond any reasonable doubt.