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Regulators probe whether DraftKings and FanDuel offer games of skill or gambling
DraftKings and FanDuel go on defensive as New York attorney-general probes allegations
FanDuel, DraftKings and Yahoo are in danger of attracting official scrutiny
Co-founder of the Edinburgh start-up recently valued at $1bn explains its rapid expansion
Company has made inroads in US sports raises funds on valuation in excess of $1bn
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