I did the exact same thing, 100% to charity every time. It makes me wonder if there were a lot of people also doing that. It would certainly explain the new 15% cap.
Given how Humble started. I always figured it was meant to be a charitable organization. Even if they have changed a lot and become more of a proper store these days.
While I wouldn't give 100% to charity. It was probably something like 90/10 between charity and Humble themselves. So it's a shame to see it reduced so much.