World of Tanks and Warthunder disagrees.
Did you even read the last line?
As well as those games being free to play, which I addressed in the rest of the post. wargame.net and gaijin entertainment marketed their products by highlighting the compelling game play within their games.
Relic spend a lot of their time highlighting the narrative story elements of their campaigns or how realistic their game is rather than highlighting the compelling game play you can spend hours on.
Hence addressing the point of: "Can't really do much about this however it's down to marketing to show gamers that there is a very compelling game to spend their time with."
There are still loads of markets around the world that find WW2 a very sensitive subject. Asian markets especially where there is massive room for growth.