It's a mix of the major players in the digital advertising industry. Historically the IAB has taken actions that are good for the industry overall. It focuses on standardization/interoperability in the ad-tech space. It generally isn't a watchdog and doesn't regulate the industry except when the industry as a whole would benefit (e.g. self-regulatory programs that have no real effect but stave off state regulation).
It's a mix of the major players in the digital advertising industry. Historically the IAB has taken actions that are good for the industry overall. It focuses on standardization/interoperability in the ad-tech space. It generally isn't a watchdog and doesn't regulate the industry except when the industry as a whole would benefit (e.g. self-regulatory programs that have no real effect but stave off state regulation).