I don't know why
It's a pretty common name for war games becuase it indicates war. but not from the same comanies, world of warships/planes/tanks is indeed made by wargaming.net but warthunder is made by Gajin
Hope that answerd you :)
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WarThunder, World of Warships, War of Warplanes, World of Tanks, etc. They have so similar names, its confusing.