Official statement from Valve.
We shared with the NYAG that these types of boxes in our games are widely used, not just in video games but in the tangible world as well, where generations have grown up opening baseball card packs and blind boxes and bags, and then trading and selling the items they receive.
You’re right! We should stop that too!
Valve is also doing this themselves and supporting others in doing it. If it is so ruled serving Valve a cease and desist to stop their own illegal gambling and an injunction to not give it a platform is something completely else from suing any other company.