He brings lotsa eyeballs to the Facebook party.
New York Times, 7/24/2021
The Internets have made us dumber. Much much dumber than we ever could have imagined. Dr. Mercola, 67, an osteopathic physician in Cape Coral, Fla., has long been a subject of criticism and government regulatory actions for his promotion of unproven or unapproved treatments. But most recently, he has become the chief spreader of coronavirus misinformation online, according to reearchers.
An internet-savvy entrepreneur who employs dozens, Dr. Mercola has published over 600 articles on Facebook that cast doubt on Covid-19 vaccines since the pandemic began, reaching a far larger audience than other vaccine skeptics, an analysis by The New York Times found. His claims have been widely echoed on Twitter, Instagram and YouTube. [emphasis added]
This is why Mark Zuckerberg prefers a Wild Wild West approach to social media.