Most copiers can have a fax card added. And most businesses that need a fax machine don't even do that. They have their VoIP phone service set up a virtual fax machine. If it even needs a physical part it's probably a little black box in a network closet, but now most don't even do that.
Real fun thing, did you know faxed advertisements were and are still a thing? At work we get like 3 random ads each day that come out of the machine.