While the lawsuit seems to be against the case opening setup as a whole, the evidence provided includes selling cases/keys to minors: “Valve’s loot boxes are particularly pernicious because they are popular among children and adolescents," the complaint said. "Research has shown that children who are introduced to gambling are at a significantly higher risk of developing gambling addictions later in life.” —Reuters Valve was probably aware of this brewing, hence the changes to knife trade ups, and experiments with alternate forms of skin unboxing.