Epic Games warns Fortnite players about bot-controlled V-bucks scams

In short, as put by Epic Games founder and CEO Tim Sweeney in a social media post, "It’s Discord bots going bad." Though, the full answer is a bit more detailed.
Polygon

Epic sues Fortnite fans who used over 20,000 bots to get paid tens of thousands of dollars

Fortnite is more than just a battle royale game: It's also a platform that hosts a wide swath of player-created experiences, much like Roblox does. Developer Epic Games encourages fans to make islands ...
Game Rant

Fortnite OG Players Are Getting Sick of the Bots

Fortnite OG mode has many bots, causing disappointment among players. Bots in Fortnite OG often display poor gameplay, making them easy to spot. Epic Games has not confirmed bot count, but may address ...