Craigslist

Craigslist became a classifieds empire by gutting the newspaper industry, starting as a 1995 email list from Craig Newmark's personal hobby. The site grew organically to over 80 million monthly users in the U.S. by 2023, generating an estimated $1 billion in annual revenue with fewer than 50 employees. Its free postings in most categories disrupted traditional classifieds, which charged up to $50 per ad in major papers. The platform's simplicity and lack of venture capital funding allowed it to dominate without external pressure, a stark contrast to the high-burn startups on this list.