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Duh.
(There's also the paper dolls.)
And it isn't that westerners don't get it, it's that they have a different tradition of entertainers. And the vtuber industry needs fresh content, so both east and west fill it out where they can.
There is no "twitch thot" distinction to be made. That's just an insult incels came up with. You don't like vaudeville and want to go back to Japan's girls.