Their previous top charity, Village Reach, no longer has much room for more funding. Which is a good thing
And implies honesty as well - hard to imagine a charity saying, 'no, we're actually pretty good for funding right now'.
Which means that if they do request funding in the future, there's more of a reason to give it to them.
As of today, GiveWell has two new top charities:
1. Against Malaria Foundation
2. Schistosomiastis Control Initiative
Their previous top charity, Village Reach, no longer has much room for more funding. Which is a good thing: partly through givewell's influence they now have as much money as they can put to good use.