Is it possible to do that without having to set up payment information?
(Edit: Clarify that for me, and perhaps for others, needing to set up payment in order to give all proceeds to go to itch.io could be a barrier for doing it. If it is already the case that no payment info is required to do 100% then great!)
Also - might be nice if it was automatically clear to the end user that it was all being donated to itch.io