I guess you're right that many large gifts are, but what about the (combination of) small gifts? And all returns on interest on such gifts? I mean if I donate m

I guess you're right that many large gifts are, but what about the (combination of) small gifts? And all returns on interest on such gifts? I mean if I donate money I don't know what contract would exist preventing it to be used for this sort of a purpose. Who would the contract even be with if I personally don't agree to it and I'm the one donating?