I deposited cash into Pokerstars, and then submitted a withdrawal on the same evening without using the money. They have sent me an email saying that they refuse to return my money without me wagering it. Here is the text from the email.
Hello rachelmc7,
Your recent withdrawal has been canceled and the funds returned to your Stars Account.
To maintain the high level of integrity associated with our products, and as an automated control to remain compliant, players are unable to withdraw funds from deposits, without first wagering these at least once (x1). Any return (including winnings) from the bet or buy-in will be automatically cleared for withdrawal.
We thank you for your understanding and cooperation.
Regards,
Stars Security