The plagiarism angle is why I'm not too confident about Ghost Writer compared to many here being sure it's the next big hit. The story is really well constructed so far, but I don't know if readers can look past that or not. I get the idea that it's probably planning to show him finding his talent as the series goes on but it still irks me that we're reading about a guy who's having success because he plagiarised a future manga (even if he knows it's wrong).
The harassment in Undead and such is just quick gags and easy enough to skip over or treat as just a quirk of the series. Same with Chainsawman, Death Note, etc, they have objectionable things but it's easy to keep their acts at a distance because they're fantasy, they're disconnected from real life so it's easier to treat it as part of the series and not let it bother you personally.
A manga about a guy with no talent who plagiarises other more popular manga is too close-hitting to ignore. It feels like it's looking down on other manga and not in a fun satire way while lovingly embracing the cliches it's satirising like Medaka Box, rather it feels a bit mean-spirited because we're meant to sympathise and identify with him. Like it's saying to the reader 'this is you, your ideas suck because you're just copying popular manga you write'.
I know it's not the intent, but I can't help but feel that way reading about a series where I'm meant to relate to a guy who's plagiarising other better writers.