Ok. It is a good question and Answer you will find out in FAQ section or i also Can Give you a short descripsion. Well, First time they offering free Hosting and when you design their logo will visible in your site and the get popularity.
colored contact lenses. Secondly, They must Charge you After 1 year that means they offering you for free just for 1 year. Because no body wanna close their site so they must pay for it.