For the most part, we're publicly always open. However, we may get someone to plug our server and may ask us to whitelist.
If by some chance I'm not online and this does happen, YouTubers are allowed to whitelist the servers themselves by typing.
Sometimes the adding a player doesn't save therefore forcing a save a reload via whitelist this will negate the need for rebooting the server.
Game rules were added to Minecraft as a new way for basic way to protect in vanilla. It's completely basic and hopefully in the near future they will add some new game rules that we are able to fully utilize.
In vanilla there are scoreboards and I’ve and by creating dummy boards and enabling them, you I add specific users to teams, automatically. This allows me to set essentially a rank in chat without the need of client-side mods.
Colors and Ranks