I think it's ignorance on the part of restaurants.

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There are also a lot of "successful businesses" that cater specifically to... serving what they say they are serving, even if someone might not have heard of it. It's why a cheap Americanized roll of sushi with spicy mayo and avocado costs a fraction of a piece of fish that the person who is upset their sakura drink doesn't taste like the wrong thing would say "ew, it's raw."

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You will notice several people share this criticism in these comments.