I dunno, why the hell every time these isekai MC has some doubts, the go to action is almost always "yeah, let spill all the spaghetti I have to random strangers"? And that part about becoming a demon lord, isn't that all on him if he's shitty human with poor self-control? Nobody forcing him to "exploit" the isekai's gamey system, it's just there. He could just choose not to.
You think the novel is worth reading? Just asking cause some of these stories have decent starts and fall off a cliff once they actually have to write a story
He basically become a doormat to pretty much anybody with a modicrum of power, according to some of the reviews. The manga already shows a bit of that when he's dealing with guild staffs. So the dropoff point is probably in an arc or two.