When you have a million users adding every day .. you won't have time to scale .. much less build anything ..
Late is good .. almost everything that comes late ( in tech) is more successful ( not necessarily good)
- iPhone to Blackberry
- Chrome to rest of the browsers
- Bitcoin to USD
- Google search to Yahoo and excite
- Smartphone to PC
- Linux to windows
The reason is simple - tech gets better - tech leaders evolve ..
So ..