Can The Cause enforce RiotGears original promise despite the lack of consideration? Yes. Under the doctrine of blank $1$ blank $1,$ a party who makes a promise can be estopped from revoking it$.$ For the doctrine to be applied,there must be a blank $1,$the promisee must reasonably rely on it$,$the reliance must be substantial and definite, andjustice must be better served by the enforcement of the blank $1.$It is reasonable to expect that a charitable organization will incur obligations in reliance on a blank $1$ of a donation. Failing to enforce it would be unjust.