the doujin scene has a number of informal restrictions that form the basis of a pact between the copyright holders and the fans, like keeping your profits margins low
japs recognize that an active fan culture attracts a larger userbase, serves to train artists' skills, and helps keep tabs on what's popular and what isn't, it's a win-win scenario and if everyone plays nice there's no reason to go after anyone
but if, say, a large game company has its fans making modifications to its games, facilitating piracy, or creating imitations... now that's a rival, isn't it? an issue to be dealt with
btw i have zero sources for this so just trust me dude
>>147944you can actually buy digital doujinshi online, i just went to dlsite and immediately came across this dragon ball doujin:
https://www.dlsite.com/maniax/work/=/product_id/RJ01334181.htmlit even lists JPEG as its format