They exist because there is value in what they do: They put eyeballs in front of games = sales They handle logistics and payment = do game devs want to be a ga

They exist because there is value in what they do: They put eyeballs in front of games = sales They handle logistics and payment = do game devs want to be a gaming company or a logistics / customer service company? They provide quality vetting, curation and discovery for customers with a reasonable degree of impartiality. None of these are 'hard' but they take man hours and money to do well.