I mean if the idea is genuine and looks promising but someone just can’t get it up and running, not even the initial stage (for lack of having ZERO resources or some other reason, but is ready and enthusiastic about it)
Let’s assume all it takes is $20k. And the person with the idea is willing to share profits and ownership.
If your “idea” person has no funding then step one is to create an email list of some kind and then launch a GoFundMe or a Kickstarter. Marketing is how ideas turn into businesses.