Hi there! No official info for the BLOPS 4 beta, but the WW2 PC beta was open. Also worth noting that the WW2 PC beta came a month after the console beta. It is likely that Black Ops 4 will follow a similar schedule. Hope this helps.
5 of them on this list were made before PUBG. I get what you are saying, but I feel like just because a game did it better than other people, doesn't mean they should be on the top of the genre.
It's the same as basketball, Jordan, Curry, Lebron, etc. But I do agree, there were some before.
it's not the first but it's the best and definitely brought out the genre and gave the idea to other people to start making them