Interesting... I hadn't known that. That reduces my objection to dropping EFF.
But if it were me in charge, I'd list 3 charities. One would be the charity that, last time, had received the greatest portion of the contributions from people who had adjusted the contribution sliders rather than accepting the default value. One would be a new charity never before featured on Humble Bundle. The last would flex, depending on circumstances: it could be a charity favored by the Humble Bundle team, one chosen by the app developers, or perhaps the second-favorite from contributors who adjusted sliders.
But if it were me in charge, I'd list 3 charities. One would be the charity that, last time, had received the greatest portion of the contributions from people who had adjusted the contribution sliders rather than accepting the default value. One would be a new charity never before featured on Humble Bundle. The last would flex, depending on circumstances: it could be a charity favored by the Humble Bundle team, one chosen by the app developers, or perhaps the second-favorite from contributors who adjusted sliders.