A word of advice on copyright: The work has to be transformative enough that similarities are for referential purposes to the original work. Making a game based on an existing property and changing nothing is not transformative. You're taking an existing concept, story, etc and putting in on another platform. That's it. I love Honkai Impact 3rd, but I can't just lift the models from the game, slap together a shoddy anime from clips and shit, and call it a "parody." It doesn't matter if I make a profit or not. I'm taking credit for doing to an existing property what it was not intended for, without the author's permission. If that concept escapes you, Dev, then you deserve to get sued out the ass.
On loli content: Hilariously, the UN tried to insist Japan criminalizes sexual violence against women in their media.
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One could presume the same applies to loli content, given dlsite has its fair share, and then some. In terms of encouraging op to produce such content and "adjust the ages", I can't recommend it. Especially if he ends up going to court (which is likely, given his attitude), that's just additional fodder for the lawyers. The dev could work it into a patch and then share that patch, but that doesn't get him out of the pile of shit he'd be in already for staying the course on this game.
On "Porn Addicts": Currently, we're all stressed beyond merit. Those of us who have an excuse to get outside (job, front-line workers, etc) I would hazard to call fortunate on the basis that they live with the fear of what could happen, amplified by the power of 1,000,000 angry Ivan's. I've read the posts, actually fucking read them (unlike some sycophant in this thread. Don't worry, this is the only acknowledgement you'll ever achieve from me), and while I disagree with the vitriol slung the dev's way, I can't even shame those people. I get it. You're stressed, and feeling attacked.
Problem is, you're supposed to set a standard not just for your content, but yourself, as well. Your messaging is bad in terms of whether or not adult content is on the table, if it will be you providing it, and if it will even be available to interested parties. Obviously, my investment is nil in this shit. It's a bad joke of a rip-off for a generic isekai that only low-functioning weebs enjoyed. I've seen Re:Zero, guys. Shit is just Higurashi in Another World. Fuck outta here with this low-effort "I got sent to another world except truck-kun didn't crush my cellphone hurr hurr hurr!" Standards, people.
Where was I..? Right. The other thing is, for all intents and purposes, with respect to what OVER 9000!?!?!?! pages of content would verify in this section alone, this is
very much a porn site. A porn site doesn't need to exclusively host porn to retain that identity. It's what is at the core of their identity that matters and, as many have already pointed out, this is a porn piracy site. You can't come here and unanimously declare it is not when the community has deemed it as much. You are not judge, jury, and executioner.
As for your shitty attitude (because that is
exactly what it is), you are a goddamn developer trying to pitch your "game" to people you clearly want the attention of. Rather than this passive-aggressive "either you play it or you don't" bullshit, how about having some humility and acknowledging that these people want one form of content, and if you can't even cater to that with a patch, then maybe you're failing to appeal to your intended audience and should re-evaluate how you approach this project? Y'know, rather than these outbursts that do nothing except taint the image of you and your projects, however many you may attempt in the future?
You can claim that we're all Human and have our limits, but that's an excuse. My time on here has not been long, but I have learned over the years to step away if something bothers me, lest I go picking fights. Not always, and especially against overwhelming levels of stupid that should not be possible with current year amounts of access to the internet, but here we are. Someone with a temper such as mine, I've learned when I'm past my "breaking point" and need to step away before walls are smashed and necks are snapped. If you can consciously acknowledge that in yourself, then perhaps rather than go out on a limb attacking the users of a forum, you ought to step away, take a breather, (watch an actually good series, may I recommend Higurashi?) and, if shit still makes your blood boil when you come back, just ignore it? I do.
On this entire affair: While I personally have no interest in calling the feds (especially on some dude who clearly deserves little more than a slap on the wrist for being so ignorant of copyright laws), I would recommend the dev take a huge step back, re-evaluate everything about this project and their attitude in general, play some bad porn games (Vanja shout-outs allowed, guys?), watch some better isekai (Seriously, Re:Zero is just Isekai Higurashi and that's what makes it so fun), and I dunno, wait out this 2020 victory lap? Maybe, when you do have a concept that isn't lifted off another property, come back and wow us. Shove it in our faces, and get your well-deserved praises when you have a good project and an awesome attitude, to boot!
Just... don't continue down this path. It doesn't do you well, ever.