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DMM started in pornography and "adult entertainment", and has "grown into a vast collection of enterprises".
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In August 2017, Kameyama had an estimated net worth of US$ 3.5 billion.
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146:"How a Billionaire Porn Film-Maker Transformed His Business"
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This
Japanese business–related biographical article is a
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In 1999, Kameyama founded DMM.com, and is its chairman.
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199:"Rebooting innovation in Japan"
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