Among its requirements, the law says, "If a business collects personal information from consumers online, the business shall treat user-enabled privacy controls, such as a browser plugin or privacy setting or other mechanism, that communicate or signal the consumer’s choice to opt-out of the sale of their personal information as a valid request [under the law].
In a December 6th letter obtained by MediaPost reporter Wendy Davis and provided to The Register as a courtesy, the five ad industry groups – The American Association of Advertising Agencies (4As), the Internet Advertising Bureau (IAB), The Association of National Advertisers (ANA), the American Advertising Federation (AAF), and the Network Advertising Initiative (NAI) – complain to Becerra that such proposals would harm consumer choice."
To read the complete article see:
<https://www.theregister.co.uk/2019/12/09/ad_groups_privacy_rules/>