It’s probably because as a mangaka, Watsuki isn’t really the face of his product.
His name is on the book and gets mentioned in the credits, but Watsuki’s personal life is largely irrelevant to the manga itself.
Hence it’s harder for someone like that to get cancelled.
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On the other hand if you’re an actor, politician, or influencer, who you are as a person is very important. You are the face of your product.
So you kinda need to have a somewhat decent reputation to make it in those fields.