My Youtube autism is failing me...was it Forgotten Weapons or Inrange who at one point considered collaborations with Timeghost for their World War II project. I remember there was a large number of gun/history youtubers who initally expressed interest in augmenting their content, but all but The Chieftain and the Tank Museum backed out. I always wondred what the deal was. In any case, I imagine Karl hates project on principle for them even discussing that allied war crimes were a thing that happened.
TimeGhost is owned by Spartacus Olsson, who is his own particular type of Sperg. The most detailed explanation of what happened was from the 'Bloke on the Range Channel', they had planned to produce original content on neutral countries in World War II, but TimeGhost stopped responding to messages, I don't think that was just incompetence, I think Spartacus wanted to write/approve the scripts, and he didn't want any original research being done. He very much has a wikipedia editors mindset about 'muh sources'.
Spartacus had a hand in the Great War Channel for the first two years but then left for whatever reason, leaving it to Jesse Alexander and Florian Wittig. The Great War was a much more collaborative effort, with Indy Neidel (an actor) fronting as presenter. As I said Spartacus is an obvious sperg so that didn't work for him. He set up the World War Two Channel which he ran as an offshoot of Timeghost, and which he 100% controls.
The Great War is still going, covering the small wars and revolutions that engulfed Europe after WWI. They have a studio in Berlin, and produced their own documentary series 16 days in Berlin, which included a load of other YouTubers including Ian MaCollum. Ian wasn't great in it, it's just him speaking to the camera, also after an initial Q and A he did while it was in production Ian never promoted it.
It's pretty good, it's done new research, and gives a pretty good overview of the battle, even if it's a bit pricey at $35 for all episodes. However they're one of the few YouTubers that have managed to set something viable up off platform, so they deserve some credit for it.
With the World War II channel, I think Spartacus wanted to try and become a new crash course. You know those shitty John Green videos, which schools love using for filler.
However Spartacus is a passive aggressive Sperg, a lot of his videos are him attacking 'false narratives' which are other YouTubers that he never names (one obviously being the TIK channel). He offers (or has Indy Neidel mouth) stone cold takes on World War II, that are mainly from popular historians like Beevor or Hastings. When people @ him saying he needs to use better sources particular for the eastern front like Stahel, or Glaantz, he implies they're wehraboos. (though he has started using Stahel, but Neidel screws his face up when mentioning him, and talks about Stahel making 'big claims')
The WWII channel is weird, when they do behind the scenes videos they show like 20 staff. They went off to Hawaii to do a series of videos on the Pearl Harbour attack but it was just Neidell staring into a camera inside a room in Hawaii! with cut scenes from War Thunder to illustrate the attack!.
Also because the fucking channel started a year early (probably to stop Alexander and Wittig doing their own) it was produced for the 79th not 80th anniversary of the attack.