You know whats funny?
Badspots speedkart server had spammers and a whole stuff ton of trolls who were on it all the time because there was no administration.
ANY server needs adminstration to function. I cant think of a single server that doesn't need an admin to keep the peace.
Spamming the chat doesn't block playability of the game. If you go to a DM server, and someone is spamming the chat, you can still walk around and kill people fine.
If the person is spamming with huge font and large messages and is blocking the screen because you run in a small resolution and/or large font size, you can use client-side mute scripts or disable chat, no admin required. If someone is free killing or whatever people do to break jail rps, the only solution is to wait for an admin to kick or ban them.
Also, there are filters built into the game to prevent chat spam, and kicking/banning someone for sending four messages every 10 ten seconds requires little effort. Constantly watching a server full of many people, and listening to reports and accusations that may be conflicting, and deciding what is fair to do, requires much more effort.