When consumers see or hear an advertisement, whether it’s on the Internet, radio or television, or anywhere else, federal law says that ad must be truthful, not misleading, and, when appropriate, backed by scientific evidence. The FTC enforces these truth-in-advertising laws, and it applies the same standards no matter where an ad appears – in newspapers and magazines, online, in the mail, or on billboards or buses.

https://www.ftc.gov/news-events/topics/truth-advertising

I’m pretty sure the fairness doctrine was for giving equal time on tv or radio. We’re more talking about lies told in paid advertisements.