To me, Lean startup is not about money. It's about building the most efficient process of finding product/market fit. Once you've found something that really works, then it's time to look for big money and scale up. In most cases, what you need in the beginning is $50K-500K which can come from savings/FFF/consulting/seed round.
Too much money in the world now. A result of the decade of near-zero interest rates.