Cheat Slayer getting shitcanned gets much funnier in context and this doesn't fully represent how much of a seething hack the author is.
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SAO, Slime, Overlord, etc were all popular enough to justify being included in a parody, but then you get shit like Isekai Shokudou, which is a nothing story about an otherworld restaurant, whose only relevance to justify its inclusion is that it sold more than Kakegurui, a gambling manga with zero narrative stakes and is carried entirely by its coomer art.
Even without the spectre of Japanese copyright laws looming, the characters' delivery was also intentionally tasteless. It was less "haha I borrowed your character" than it was "haha I borrowed your character
and also made him a necrophile rapist". Like Kakegurui (and the cancelled isekai lawyer thing before it), it reeks of an author who thinks of himself as far smarter than he really is.
Isekai is by nature a terrible, self-referential, and masturbatory genre, which is even moreso good reason to not shit on peers.
Publishers may be cautious, but fans are
vindictive. I wouldn't be surprised if his shitty gambling cuck manga also got shitcanned sometime down the line.