Internet service providers would escape prosecution if they took steps to remove illegal gambling sites from their servers or blocked access to sites hosted elsewhere.

CNN: Analysis: Should the U.S. regulate or ban online gambling?

Many of the users who complained are from Europe and at least some of the spam messages are scams masquerading as messages from European gambling sites.

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In Russia, government prosecutors convinced its Supreme Court last year to order an Internet provider to block access to online gambling sites, but PokerStars, like other online firms, continues to draw Russian customers from other sites.

WSJ: PokerStars, Online Gambling Bet on Return to U.S.