What proportion had it at their founding or shortly after? Surely a well funded and successful company had the means and motivation to purchase their .com
https://en.wikipedia.org/wiki/Dropbox_(service)#2007-2011
For earlier companies, you can buy a lot of engineers, product, and marketing for $1 million.
[0] http://www.cnet.com/news/how-box-net-became-box-com-for-just...
http://brianjackson.io/view-dns-history-free/
What proportion had it at their founding or shortly after? Surely a well funded and successful company had the means and motivation to purchase their .com