2 main things to learn from here.
1. if you have any site of value, make sure you control the domain name so that you don't risk losing your hard earned link popularity, and 2. that you keep recent enough backups of your data.
It doesn't mean that action without notice is something that a free hosting provider can or should do on a whim. Even big providers should try to put a human face, and realize that public relations are important. The viral side of free hosting can work both ways.
