There is a minimum requirement for each withdrawal, along with a flat fee to cover the transaction costs of moving the cryptocurrency out...
source https://www.google.com/url?rct=j&sa=t&url=https://support.kraken.com/hc/en-us/articles/360000767986-Digital-assets-cryptocurrency-withdrawal-fees-and-minimums&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNGvftXKo3shgIbyYLftgo1N53rEUQ