Online casinos paranoia about "casino bonus hunters" is forcing them to be very creative to wean the hunter away hurting all players with complicated bonus rules. One of the most recent creations are "phantom" or "sticky casino bonuses" - the equivalent of lucky chips in land and mortar casinos. The amount of the casino bonus is impossible to withdraw, it must remain on the casino player's account (as if it "has stuck" to it), until it is completely lost, or annulled on the first withdrawal of cash means (disappears like a phantom).
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