I haven't really read into that but I'm assuming there must be some kind of authentication needed to connect printers to your Google account, otherwise imagine the possibility of fax attacks, except with printers!
But the possibility of printing from anywhere is cool, University of Ottawa already has this where you can print to any of the 14 self-serve printers from your laptop if you are authenticated on the campus wireless network. Then you just go to the printer, scan your student card and pay for the print jobs that you want to process. Somehow I tried this yesterday and no print jobs showed up though...
image if someone hacked into a number of Cloud accounts and send printings to them? that would be a disaster, especially if it's a lot of accounts




