The ad-supported tier launched in November 2022.
https://www.cnet.com/tech/services-and-software/almost-5-million-people-are-using-netflixs-new-plan-with-ads/?utm_source=dlvr.it&utm_medium=blogger#ftag=CAD590a51e
https://www.cnet.com/tech/services-and-software/almost-5-million-people-are-using-netflixs-new-plan-with-ads/?utm_source=dlvr.it&utm_medium=blogger#ftag=CAD590a51e