PrintMe internet printing..can anyone do it..to anyone?

So I found this site about internet printing called PrintMe. Apparently, if you have your printer set up on the internet with PrintMe, you can send documents directly to it and then walk up to the printer later and just enter the code it gives you to print that particular document. I was browsing printers when it gave me this option:

http://www.printme.com/206850

If someone goes to this printer and types in the code 304711 he/she should get a printout of a picture of an F-4 Corsair I took at an airshow earlier this year. I wonder if I really sent a document to this printer. If I did, what's to stop someone from overloading it with huge files or porn?

Check it out.