Moreover, the ads themselves may not be honest (e.g. they might make claims of products that are untrue, misleading, etc.), and the game developer may not be in

Moreover, the ads themselves may not be honest (e.g. they might make claims of products that are untrue, misleading, etc.), and the game developer may not be in a position to verify whether they are or not. Especially if they're just 'randomly' delivered from an ad network.