I believe they’re alluding to the wealthy funneling their money into foundations and other “charitable” endeavors as basically being a money wash that also comes with a lot of power to influence things. Their charity comes with strings and when you’re talking about the vast sums they wield, it has the ability to derail other charities or efforts that may have been more focused on the actual task/problem. If NPR decides not to run a story critical of Microsoft or the Gates’s because the Bill and Melinda Gates foundation are donors, does that charity still have a net positive effect?