Hacking printer is super easy man, moreover if the printer is connected to a network, local or internet. This is just a prank, done by a newbie hacker maybe or by bunch of kids that want to make some laugh. On the other hand hacking any cryptocurrency, at any stage, cracking wallet or any other hacking related to cryptocurrency is way more complex. Not only you need to have a really good hacking skill, but you also need a big compute power. What I am saying is that hacking printer and hacking cryptocurrency is in far different league.