Just the one: copyright.
500000
Although it is not listed on their site, one may assume it's copyright [this year] dosmething.org.
All of your photos are protected by copyright as soon as you take them.
In the US formal registration of copyright requires a one time fee. There are no recurring charges
about 5 people a year
You can't really reduce copyright; it only gets bigger. To reduce copyright infringement, there are many opinions. One proven way is to make materials easily accessible at a reasonable price, to discourage people from using illegal sources.
over 2 million people in one year
Most copyright notifications consist of the year, the name of the rightsholder, and one or more boilerplate phrases:Copyright © 2011 Answers CorporationAll Rights Reserved
different amounts every year.
It is doubtful that copyright was 'invented' by one person. The term originated in Great Britain during the advent of the printing press, the idea behind copyright thought out by the people worried that their works could be easily reproduced by other people. The Statute of Anne in 1710 made copyright something that was regulared by the government.
One to many