Justify it however you want, its not (IMHO) adding value to society and has created perverse incentives on the internet. Donating to "efficient" charities does not excuse what you do for a living. That was thrown out there first to virtue signal, but something tells me if that is your first argument you know that what you are doing isnt good for society. I honestly would feel better about the guy if he just said 'I work on ads. They pay me a shit ton of money. I know its a dirty business, but right now I want to get paid'.