A lack of players is cited as the reason.
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Bethesda announced that they will be removing the Nuclear Winter battle royale game mode from Fallout 76. This mode will be pulled from the ongoing online game at some point this September. This comes from the company's latest Inside the Vault blog posting.

As with most of these decisions, the move to shut down this game mode came down to the fact that it was losing players over time. Players simply preferred to partake of other game modes included in Fallout 76. A full statement on the reasoning behind their decision can be found below.

"When we first introduced Nuclear Winter, we were thrilled to watch so many players from our community, as well as many newcomers, dive head first into our take on the ruthless last-player-standing Battle Royale genre. Over time, however, we’ve seen the vast majority of players prefer to explore other aspects of the game. It has also become tougher to put full Nuclear Winter lobbies together without also making sacrifices on match wait times.

"Additionally, we’ve found it challenging to provide meaningful updates for Nuclear Winter, while also developing and supporting exciting new content for Adventure Mode in recent and upcoming updates. With all of this in mind, we are currently planning to sunset Nuclear Winter Mode in an update coming this September."
The Nuclear Winter battle royale mode was added back in the Summer of 2019.

Bethesda says that they are working on other game types that will be added to Fallout 76 later on. They say that they will share details on this new content later this year.

Those that played Nuclear Winter religiously won't be left wanting though. Bethesda says that they will be giving some in-game rewards like Perk Coins.

"When Nuclear Winter goes offline, we’re going to fill your characters’ pockets with Perk Coins, which can be used to upgrade your Legendary Perks in Adventure Mode. Each character will receive 6 Perk Coins per Overseer Rank they achieved, up to a maximum of 600, as well as 1 Perk Coin for each Overseer Ticket they earned, up to a max of 200. All players who completed at least one Nuclear Winter match will also receive a Nuclear Winter themed Pennant for their C.A.M.P.s."
Bethesda is also offering up a chance for new players to dive into Fallout 76 for free. From now until June 16, you can play Fallout 76 through your platform of choice. During this time, double XP will also be enabled through all game modes. Want to keep playing? The game will be on sale for 67% off.