He did not have to provide lifelong project and work on it. He just needed to donate his money and people in UN would have worked with that money. Even if it didn’t work, he’d still have done a real great job by donating that much. And maybe we could have learn money is not the solution and we need to change approach.
Now think, patents are similar things but for with more money. And imagine if someone else had similar idea and made slightly similar website you go sue them coz you had the idea first.