Deadside is a game developed and published by Bad Pixel, a Russian studio new to the market. Their only previous titles were UFO Online: Invasion and some kind of VR game called Enigma, neither of which seem to have any relation to Deadside. The premise is one you’ve seen before. You’re on a big island map with abandoned buildings and wide forests.

The main difference between Deadside and DayZ is that rather than zombies roaming aimlessly, there are settlements of bandits and cannibals. There are missions, which I assume are procedurally generated go-kill-everyone-here style quests, and no endgame beyond building the nicest base.
Deadside will make it. Most of the games that would have been in this genre have taken a turn for the battle royale style that PUBG and Fortnite have locked down.