system
Given the following post, respond as if you're commenting on Reddit:
human
[40k] What do the Traitors actually, well, do, day to day?

A common question I see with 40k is what does the average Imperial do day-to-day, and there are plenty of good answers for it.

But what do the chaos-sworn Traitors do? I mean, I can imagine that the Traitor Astartes lives are just sort of a perversion of the normal Astartes life - train, meditate on The Emperor... err, Chaos!, maintain their gear, and generally just revel in being badasses, etc. And I can suppose that the Dark Mechanicus is busy making engines of Chaos and such. But what about the legions of Traitor guard? I don't suppose legions of them are just sitting around in their Chaos Bases with their Chaotic thumbs up their Chaotic butts, right? Are they... living some sort of life? Where do they get food, and who prepares it? Do they play their evil card games and evil sports in their downtime? How much humanity is left to them, and how do they express it?
gpt
They're trying to eke out an existence, Astartes and humans alike. There are planets in the Eye where farming is possible, and those are among the most prized assets the Legions have and therefore viciously fought over. All out wars were fought over access to clean water, that inflicted casualties comparable to those taken in the Siege of Terra. Warriors that served together in the same outfit since the Heresy War murder each other to get spare parts or working armor components when their warband falls onto hard times. 


The baseline humans have it even worse. There is a hierarchy: Those with actual skills like troop commanders, higher level ship crew, armorers and the like get halfway decent supplies and protection both from the other human dregs as well as the more deranged Astartes who prey on the humans for fun or sports. The frontline troops of the Lost and the Damned get grueling training day in and day out, during transport they are often herded into mass holds and sedated with gasses until their time has come and they're revved up with Frenzon and Slaught and sent to take a bullet that otherwise would have hit someone more valuable.


All others are left to their own devices, if they don't find/steal/grow food (most likely stuff like fungi and Corpse Starch™) and water on their own they die. No one knows or cares how many of the Voidborn dwell in the bowels of the ships. When the Astartes have some capacities to create reinforcements their children might be taken in for induction when no other source for recruits is available.