A classic startup strategy is to "unbundle" a large company by attacking narrow areas to win segments. The classic depiction of this "Unbundling Craiglist," the firms on that list raised billions, though, as the update shows, not all made it. @CBinsights has made other examples

Some sources...

On the original Unbundling Craigslist: https://www.cbinsights.com/research/craigslist-unbundling/

On the update (which also argues that much of Craigslist has been "rebundled"): https://acrowdedspace.com/post/166470695392/the-rebundling-of-craigslist

Other CB insights articles: https://www.cbinsights.com/research/disrupting-unbundling/