Some additional missing context which makes the situation worse:
After Key_Complex_150 proposed the original challenge, another person made another post which upped the ante and offered another $1000, but only if the devs did the challenge with absolutely dogshit loadouts, and only if they could manage to fully clear an entire operation.
This was blatantly more of a 'fuck you' challenge, and even top players would've struggled doing it.
Now, because this new challenge was more of a troll challenge that would've just resulted in the devs being railed and suffering, and is 100% not possible for the devs who we already know aren't good at the game, some 'people' felt that it wasn't made in good faith.
They felt that the issuer of the challenge was basically trying to goad the devs into suffering for entertainment, because not taking the challenge would mean no charity money would be given.
This train of thought gave rise to the idea the the issuer was "holding the charity money hostage" just to fuck with the devs.
With the above in mind, these 'people' set out to dox and harass the issuer, calling his place of work and the like to screw him over. And here's the kicker: they doxed the first guy, not the person who made the additional challenge, meaning they doxed the wrong person for the wrong reason.