the lines have blurred. ".com" was supposed to be designated for commercial businesses.
.net and .org have no restrictions, The extensions with restrictions soon die. .LA-- which belongs to Laos used to have restrictions but they decided to open it up and become the official extension of Los Angeles.
.CA --- you have to be a Canadian. .TV belongs to Tilovi but anyone can buy it..
.jobs - you have to jump through hoops for.
here are some of the restrictions:
http://www.domain.com/domains/search.php
..