No. My personal canon has always been that encountering other humans in the backrooms (any level) is very rare. Some people manage to form large groups, but they are rare. One of the reasons why I chose to join this wiki rather than wikidot was because I disagreed with the wikidot removing colonies in level 0. From a creative perspective, I am deeply invested in the concept of groups on level 0 as they feature prominently in my story plans.