From "App-Store Bill Targeting Apple, Google Is Approved by Senate Panel" in Friday's Wall Street Journal:
Sen. Richard Blumenthal (D., Conn.) likened Apple and Google to railroad monopolies who own the means for other companies to get their products to market.
“Consumers, if you are watching, you pay more because of the monopolist rent fee that is charged to you as a result of their monopolistic power,” he said.
Sen. John Cornyn (R., Tex.), who voted “no” Thursday, suggested the fees were fair compensation for the platform the companies provide.
“I hope we’re not, by focusing on these specific cases, suggesting that somehow there is something wrong with creating a new product that has value to consumers and making a profit and creating jobs,” Mr. Cornyn said.
My take: There's the issue in a nutshell.