Server EULA. Freedom of Expression

Do not start restricting speech in unofficial Minecraft servers, allow them to have their rules, how they want their server to be ran. Restricting speech starts with the stuff that makes sense(racism, slurs, etc), but quickly could go down the line of restricting content based on what country you are in, because that country doesn't like this idea, there are whole Minecraft servers dedicated to promoting freedom of information and speech, and by starting to restrict speech across servers that are not partnered with Mojang, its a slippery slope into what could become censorship in other countries, and across Minecraft as a whole.

TLDR, you start restricting what people can do on Minecraft servers and how they can express themselves, you open the door to having countries force you to start censoring speech that they don't like. Minecraft is a game is where you can freely express yourself, don't change that.