There's also jobs that exist as the result of Moloch traps, e.g. many corporations need to keep a lot of lawyers on staff because their competitors are litigiou

There's also jobs that exist as the result of Moloch traps, e.g. many corporations need to keep a lot of lawyers on staff because their competitors are litigious. If they all agreed to be less litigious, they could all realise a huge net savings. I imagine much of advertising is similar, albeit in a less straightforward way.