What does the policy mean by servers? "Hosting a server" might include hosting custom games in Warcraft III or hosting netplay games in $FIGHTING_GAME_OF_CHOIC

What does the policy mean by servers? "Hosting a server" might include hosting custom games in Warcraft III or hosting netplay games in $FIGHTING_GAME_OF_CHOICE. It might also include operating some machines that are "servers" even if they are not running any particular "server" software.