When a goaled campaign exceeds its goal, a tiny portion of the surplus flows forward to other campaigns in the same category. When one cup runs over, another gets filled.
When creating a campaign, the fundraiser chooses what percentage of any overflow funds automatically overflows to other verified campaigns in the same category. That percentage is shown to every donor upfront.
Once a campaign is fully funded, the overflow percentage the fundraiser chose at the start is automatically set aside from each new donation. Only that portion flows forward, not the whole gift.
Once a campaign exceeds its goal, the overflow percentage is automatically redirected with no extra step required from the donor. It just happens.
Overflow funds go exclusively to verified campaigns in the same category that are still short of their goal. Fully tracked, auditable, and isolated until distributed.