What are ftp user accounts for?

Two weeks ago, DH Support told me that I had to get data stored in FTP accounts off the system because it was a violation of the Acceptable Usage Policy (personal backups): https://www.dreamhost.com/legal/acceptable-use-policy/

“With the exception of DreamHost Dedicated Server products, the customer
agrees to make use of DreamHost Web Hosting servers primarily for the
purpose of hosting a website, and associated email functions. Data
uploaded must be primarily for this purpose. DreamHost Web Hosting
servers are not intended as a data backup or archiving service. DreamHost
Web Hosting reserves the right to negotiate additional charges with the
Customer and/or the discontinuation of the backups/archives at their

But some people are still setting up ftp only users. https://discussion.dreamhost.com/thread-147555.html What are these ftp users for if this is the DH policy?