Because 'economics'. Switching costs, network effects, etc...
Here's my favorite book on the subject: http://amzn.to/1JMtX0X
And yes, that's an affiliate link: https://news.ycombinator.com/item?id=10982630
Here's my favorite book on the subject: http://amzn.to/1JMtX0X
And yes, that's an affiliate link: https://news.ycombinator.com/item?id=10982630
That site looks like 1995 called and wants its web page back. It's a triumph of non-engineering.
But that network effect. Man oh man.