The vast majority of companies don't fit the VC Fundable box - and many that think they do are misguided (even if they can convince even investors otherwise).
VC's fund about 3,000 companies a year (not all are startups) Angels fund maybe 50 or 60 thousand. But some 500,000 companies are stared in the US every year. So most of them scrape together funds and then get paying customers.
If you are considering an indie startup, I would focus on how quickly you can get money from customers (there have been cases where customers pay to help a company get launched) rather than investors.
I really like the Indie.vc experiment. I know that payback out of revenue is working for some funders but they mostly fund companies with existing cash flow who need money for growth. The failure risk of startups is so high, it's hard for investors to get a commensurate return.