Or not created directly, but just some law of the universe that cheating isekai'd folk get loyal, braindead groupies that exist solely for them, but only as long as they're undefeated as a way to parody all the slop with instant harems.
Nah, that seems meaner than the manga's been. There's precedent with the stalkers, but they felt like a force of nature rather than a particular person like the elf.
Why do all of the good series get canceled? Meanwhile garbage like in another world with my smartphone literally has a sequel series. Death March into another world has over a hundred chapters.
If the good series don't get canceled they will eventually become trash. Like some wise guy probably once said(don't remember where I heard it), "you either die a hero or live long enough to become a villain yourself"