I think the gaming world just really latches onto tends. A few years it was survival/crafting games, before that RPG's. Good luck figuring out what's next!
After a few weeks of that, the game format grew stale, and I stopped playing HG maps. Then a few years later a whole bunch of BR games hit the scene and all I could think of was how similar they were to the Hunger Games Minecraft maps.
That's just my guess from personal experience.
I think Minecraft can't be overrated as a vehicle for experimentation in multiplayer modes. Not only did the game have a huge modding and multiplayer community and have support for large player counts and maps, but it's unusually easy to create for and the game itself has no built-in structured competitive multiplayer gametypes, which means there's tons of demand for people to make gametypes from scratch and there's no built-in code for how matches work that needs to be worked around for new ideas to be attempted. Many other online games have specific ideas of how matches work built-in that reduce the demand for brand new gametypes and could make implementing a gametype where matches work differently daunting.