HP's CEO admits that the company wants to make printing a "subscription".

I am concerned about malware in printers. That includes malware inserted by third parties, and malware inserted by the printer manufacturer. Any software designed to snoop on, restrict or interfere with the user is malware.

One way to block malware from affecting anything outside the printer is to put the printer on a separate ethernet which talks only to a special computer which won't allow it to communicate with anything else.