The author points out that the publisher of a book of mushrooms cannot be held responsible for recommending people eat poisonous mushrooms. This is OK I guess because the author _can_ be held responsible.
If the author had been anonymous and the publisher could not accurately identify who should be responsible, then I would like to live in a society where the publisher _was_ held responsible. I don't think that's unreasonable.
Over on the internet, content is posted mostly anonymously and there is nobody to take responsibility. I think big tech needs to be able to accurately identify the author of the harmful material, or take responsibility themselves.