I think the people have a decent lawsuit against the gun manufacturers that kept producing guns after the bump stock devices were available for them.  They became illegal weapons by the old machine gun statutes when they could be easily converted to full automatic.  So by the way I'm reading it the bump stock folks made the guns illegal.  I'm sure the courts will sort it out after 22,000+ lawsuits against the manufacturers of the machineguns and bump stock devices from Vegas.