Facebook and Google’s share of online ad spend is slowly eroding, but that’s mainly due to another walled garden: Amazon. But how can independents get a larger share of the action amid demand for a more diverse marketplace? Despite ongoing concerns over trust and transparency in digital advertising, CMOs are still willing to invest more… https://www.adweek.com/programmatic/how-an-open-approach-can-help-independents-survive-as-walled-gardens-decline/