Wikipedia is chock full of advertising
There are thousands of adverts on Wikipedia, typically masquerading as business articles, or business biographies. It's obvious that volunteers alone aren't going to compete with those paid to edit, and most of the volunteers are not interested in policing business articles.
The foundation should adopt machine learning tools to highlight edits by suspected corporate sockpuppets. There are so many obvious signals that the editor is paid, the account activity, the categories pages edited, the date from account creation to first edit, the IP address, the other accounts on using the same IP.