Helldivers 2 has a few different currencies, but the one that everyone wants is the Super Credits. They're the premium currency of Helldivers 2 that you can use to unlock cool armor in the game's store and the premium Warbonds, which are filled with goodies.
They can be either be bought or found scattered pretty liberally across pretty much every planet you drop onto, which is unusually generous of a live service title.
Unfortunately, some players have been taking advantage of developer Arrowhead's kindness. With a free way to earn Super Credits, there were always going to be people who went out of their way to farm them, and a recently discovered exploit has made it much easier to grab Super Credits in bulk, albeit very slowly.
Helldivers 2 players were quick to notice that if you grab some Super Credits and then force quit the game on your PC or turn off your PS5, the currency would still be in your account despite not having completed the mission.
There's every chance you may have run into one of these individuals during your drops, and it can be very irritating to feel like you've got some nice squad synergy going only for a rando to dip once they've got their Super Credits fix.