The article explains that the federal and state governments did do something about it.
Well, the "something" the Trump adminstration landed on (with an investigation started by Biden's team) I think for OP wasn't enough. A small monetary settlement without jail time of the executives involved is hardly the "something" that needs to be done in order to curtail this behavior and stop it in the first place. When the people who committed a crime still gets to keep any amount of their stolen money, that, to me, is less than "something".
> “The reason, in this case, not to pursue litigation is that the conduct had already been resolved, right?” [U.S. Associate Attorney General Stanley Woodward Jr.] went on, referencing the decline in egg prices.
They stopped this particular instance of it after the horse already left the barn and did nothing to dissuade future anticompetitive collusion.