It's a WW2 flight combat simulator being made by a Russian company (1C) in conjunction with a US distributor (777 Studios). They call it a 'sim' but it's not a sim, it's a game. One in which they have bent certain parameters so as to hugely favour the Russian aircraft and nerf the German ones.
In order to hide their chicanery they have been hiding negative posts in an access-only forum (only purchasers of the alpha version can get in there, at £50/$100 a pop), deleting threads and posts and harassing, bullying and threatening posters via PM, along with 30-day bans.
Then they put the game on Steam. And have now continued their behaviour there; locking posts and banning Steam Account holders from that forum despite them breaking no rules.