Actually there is a big difference. To be technical a content publisher would be known as a content producer, and is treated far differently than a content distributor.
It's like the Mann act.
The Mann Act (also known as the White-Slave Traffic Act of 1910) is a federal law that criminalizes the transportation of “any woman or girl for the purpose of prostitution or debauchery, or for any other immoral purpose.”
The person who puts a woman on a bus, or a plane, or into a taxi out of state would be considered the producer. While the airline, bus company, or Uber would be the distributor.
With legal liability going solely to the producer, and none to the distributor.