I'm sorry for the digression, but why are these investors guys called angels? Can you imagine an angel that gives you an offer: a bit of help with your difficult situation right now for 25% of your soul?
There's something special about seeing the future and investing on a team with a dream. It's not the cash flow analysis of growth equity they teach you in school.
This is one unsourced data point, but Axios says "bootstrapped startups typically grow slower and cap out lower than do VC-backed startups" https://www.axios.com/mailchimp-potential-sale-intuit-talks-...