What a no deposit bonus with keep-what-you-win wording actually means
A no deposit bonus is a promotional credit or set of free spins given to a new account without requiring a deposit. The phrase keep what you win describes the intended outcome: after meeting the attached conditions, you can withdraw the winnings generated from that bonus. The bonus amount itself is rarely withdrawable. What you may keep is the residual profit after the operator's rules have been applied, not the original credit.
The mechanism works in stages. You register, receive a small balance or spins, play eligible games, and any balance above the original bonus becomes potential winnings. That potential is then filtered through wagering requirements, game restrictions, maximum withdrawal caps and time limits. A no deposit offer can produce withdrawable cash, but the path is deliberately narrow. The wording keep what you win is a marketing frame, not a contractual guarantee.
Australian players usually encounter these offers on offshore casino websites. Australian-licensed wagering operators such as TABs and corporate bookmakers focus on racing and sports, not online casino games. No deposit casino bonuses of the kind described here sit outside the Australian licensing framework. That changes how much protection you have if a dispute arises over what you win.