No, it was not made by Arma guys. Brendan Greene had the idea for a famous mod called Battle Royale for Arma 3 which he even did not program.
If you want to learn how to shot guns and ballistics play Arma 3, not PUBG.
Having to aim up higher for 300meters with an ACOG and a M4 or even a K98 (PUBG) is bullshit.
And somewhere someone called me a hater, who played it for 350 hours. Thats right - you need time to get the full picture of a game. And as I am taking gaming somehow more or less serious I can't enjoy games where I get killed due to desync or bullshit situations.
Now to desync topic someone will come up and tell me Escape from Tarkov has much worse netcode / desync / lag whatever but what i can say about my experience, i have not recognized any major issues in the last weeks. (Still from Germany - dont know where exactly the servers are) and having good performance (70-90 fps)
edit 1: roughly ~2700 hours arma 3