… is from page 36 of Steven Landsburg’s excellent 2019 volume, The Essential Milton Friedman:
In a capitalist society, you can turn to anyone who’s willing to fund you. You can appeal to the grass roots, but that in turn might require some funds to get you started. It might be more effective to approach a wealthy donor – and if you’re turned away, you can approach another. You don’t even need a wealthy donor who believes in your cause; you only need one who believes there’s money to be made by selling your books and videos or by promoting your website. You might not succeed, but you’ve got a lot of options. And indeed, capitalist societies, including the United States, have always been rife with anti-capitalist propaganda financed by wealthy capitalists.