Digitan: This doujin author...
Poster: The Transdimensional BOOBA
Digitan: How could she do such a thing!?
sfx:BOOIIIINNNG!
Digitan: Didn't the guidelines forbid inflating Suzuka-san's bust size?
Dober: Rules mean nothing to a doujin profiteer.
Doujin-goro, "doujin rogue/gangster", basically someone who engages in doujin activities to profit from it, usually pirating/plagiarizing stuff in the process.
Of course, the term also sometimes get leveled on 'casual' fans who don't follow the usual fandom interpretation of a character...
Digitan: They are unafraid of anything, huh.
Digitan: These doujin profiteers...