While Fortnite's Respawn Rumble mode isn't really its most popular, it suddenly exploded yesterday with waves of players coming in. However, they weren't really there to play the game mode, but to leverage a glitch which offered them tens of thousands of XP points for doing absolutely nothing. The glitch doled out enough XP to clear entire battle passes in a few hours.
As noted by VideoGamer, Fortnite's Respawn Rumble mode barely gets 1,000 concurrent players in a day, but that number shot up to over 12,000 once the glitch was discovered. It's so simple to execute that you can't even call it an exploit at this point.
There's not much to perform really. All you need to do is load up into the Respawn Rumble mode and exit it as soon as you're in the bus. You can then watch Epic give you over 35,000 XP doing absolutely nothing but taking a short bus ride. You can repeat the process as many times as you like to keep the XP rolling in and tick off those battle passes.
Obviously, Epic did not mean to dole out free XP in such a manner, so you can expect the devs to...
