Even Nationstates provides ways for teachers to oppress their students...

Check this out:

"Special Features for Teachers

To facilitate its use in classes, NationStates allows educators to establish a special class region, within which students' nations reside. This region is isolated from the rest of the game world, so students cannot communicate with or be approached by other players.

Nations in a class region:

• Are automatically added to the United Nations, without needing to supply an email address. (Normally, each nation that wishes to enter the UN must supply a unique e-mail address. Additionally, checks are performed to prevent players from operating more than one UN member nation. These do not apply to class members.)
• Will not receive daily issues that could be considered adult in nature.
• Cannot receive telegrams from or send telegrams to nations outside the region.
• Cannot leave the region."

To check out Nationstates, click on the link on the right of the page which clearly stated, "Nationstates"