They can withdraw their funds at any time. They'll also earn yield on their deposited tokens in the meantime.
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Plasma Attracts $500 Million for ICO—And One Trader Spent $100K on Ethereum Gas Fees
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Plasma’s vault model allows users to earn yield on their deposited stablecoins while retaining the option, but not the obligation, to purchase XPL tokens, with full withdrawal flexibility at any time
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