You can't prevent people from being afk. There is already a system that kicks inactive players. but if a person decides to hide&camp until the end of the game, he is free to do so.
April 2019 - last edited April 2019 by DYSPROssium
No you don't understand! They afk on purpose to get xp. They enter the game and then quit to get free 30 xp. Before they quit they something in chinese that I can't understand (it's a record playback of a website name www.144.Com or something like that I can't remember.
[edit: stop using all caps]