this is speculation but I think I'm on the mark.
what really happened that made IL2 software get in the hands of third party developers like gaijin (war thunder) and 777 (Rise of flight)? and what are the odds of HTC purchasing the same graphics engine?
I believe that Oleg Maddox' 1c software company faced a crisis in the disaster that was IL2 cliffs of Dover and they were probably nearing bankruptcy.
if this was the case with his back against the wall this genius programmer chose to sell his IL2 software to third parties to raise money to keep his company going for another project IL2 Battle of Stalingrad which Oleg has partnered up with one of the studios he sold his software to 777.
I think Oleg might regret selling his software to Gaijin and their relationship is likely adversarial as they have taken great effort to make no mention of the fact that War thunder is a blatant cut and paste copy of IL2 software that is uncredited. in their credits they credit the long dead composer Lugwig Beethoven for his music but give no credit to Oleg Maddox whos software abilities which are more impressive than beethovens music abilities made War thunder possible.
when you examine War Thunder closer you can see everything this third party developer has talents in is not aircraft or flight sim related. They have talents in making fun games and setting up entertaining scenarios but looking at their 3d models and skins and seeing how bad they are at getting decent flight model programming accomplished (individual plane performance. these guys are not capable of actual flight model engine design that much is obvious. IL2 is their crutch and its painfully apparent.)
I give credit to Gaijin for their ability to make IL2 fun. this is no small feat and they have done well with their gameplay mechanics and even mouse aim and its bastard ability to let mouse users be OP and turn off the very il2 flight model engine that I am speaking of has filled the ranks of the game for the time being with regular gamers and even made console gaming possible. but it is IL2 to its core. when I pop into a cloud and my plane shakes or when I hit wake turbulence below and behind a plane I am following I now very well who really wrote that code. it was a guy who made a lifetime of aircraft design and turned their passion of flight sim programming into a business. credit where credit is due? you be the judge.
at least 777 isn't ashamed of where their programming came from... why should they be they partnered up with the guy lol.
Other 1C Game Studios Games
Discussion about the classic series IL-2 Sturmovik, IL-2:COD and Rise of Flight
http://forum.il2sturmovik.com/forum/20-other-1c-game-studios-games/