Just read this article in the Developers Corner over at the epic Formidable Masterminds site. It's a cautionary tale, to be sure, and a thorough post mortem of an illuminating interaction with a naive entrepreneur whose ambition was far greater than their capacity or their commitment.
I have had similar experiences where people have come to me with fever dreams they are either unwilling or unable to fund.What's interesting in the age of low code/no code, is that unscrupulous bad actors are cropping up who want projects detailed for them before they commit. I now consider whether I introduce a fee and clause for creating a blueprint so that bad actors are on notice and also compensate me upfront for my time putting together their roadmap.
Victor and Co's site is a valuable resource for people doing some truly heavy lifting, crafting solid solutions built on WordPress.