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Since this activity that you described involves a game of skill it is not likely this would be deemed illegal gambling under Florida Statutes Chapter 849. See following link
http://myfloridalegal.com/ago.nsf/printview/DEF7C36F0D75C323852563D2007AA34C. It is an older opinion but instructive.
In any event, whether this activity is legal or (even) illegal, any gains will be considered income. You could presumably deduct any fees and other costs and remaining balance would be income that you would be obligated to report and pay income taxes on.
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