Why is 90% withdrawal converted into a full withdrawal of the portfolio's assets?

As we can only trade when the market is open, we cannot guarantee that we will be able to sell your assets for cash at the exact moment that you opt to withdraw your funds (which you can do anytime). Therefore, the value of your portfolio may fluctuate within those few hours. In order to ensure that we have sufficient assets in the case of a market change, any withdrawal request that exceeds 90% of assets under management will result in a full withdrawal to buffer against sudden changes in the market.