Once upon a time, back in the ancient history of the Internet–before the 1990s–domain names were carefully controlled and regulated. A single organization controlled each top level domain. If you wanted a domain name, you had to meet their requirements. Often the policies enforced were quite picky. If you wanted a .uk domain name, you were required to actually be in the UK, for example. If you wanted a .org domain, you were required to be a non-profit organization.