Yeah, I don't understand how this could've taken more than a couple of e-mails when the work was already done. Why the heck wouldn't Julian ask Markus to step in once he became uncomfortable with e-mailing Carl? Why didn't he just say "ok this took me X hours, so X euros is fair compensation"?
It's very hard for me to read this in a way where Julian doesn't come off as, at best, an idiot, and at worst, an asshole who thinks writing two pages of text is equivalent to the thousands of hours of labor the five Mojang employees had put into the project at the time.