First - You can understand the logic behind the World Wide Web - from it's name.

 It belongs to no particular entity - Human/Company. The whole WWW is completely everybody's Intelectual Propriety but Specific web sites/applications/content/publications and so one are the IP of specific entities.

You can open a site exactly as you can decide to publish a book - but the difference is that you need a publisher.

 The only thing you do need is a storage place to store the contents of your web site - it can be your domestic computer and it can be a hosting company.

As I said before - Nobody is in charge so actually nobody put them there...

Boaz