Whether this has happened due to a bug (i.e. Marketplaces were never supposed to use RDMs but be "hardcoded, which IMO is highly unlikely due to the fact everything in the game uses the same systems that players use, even market tiles are claimed using territory units) or due to incorrect settings in RDMs, the whole thing has been blown out of proportion. Did the players make a mistake by making and publicizing the "ultimate heist" on Reddit? Possibly. Most likely yes. However that only sets the scenery to what is essentially a "make or break" decision on the NQ's side.
Had NQ reacted in good humor, fixed the problem, and owned up to their mistake, they'd actually build and reinforce trust of their community. They would've come out on top, as a team that can take responsibility for their mistakes and fix them. As someone with years of community management experience, I'd go a step beyond that: I'd create a "ruin of a marketplace" with a memorial plaque that would say something along the lines of "MP15 has fallen prey to a legendary group of bank robbers", to make it part of the lore. Then I'd build a new Marketplace next to it, and recover lost items to the unfortunate players who had their stuff listed. The lesson is simple: Does it seem like bad press? Take ownership of it, turn it around, make it work for you.
It's very unfortunate that instead NQ reacted the way they have. Their response, and reaction of Discord moderators who started handing out mass bans for even mentioning the incident is what creates bad press. I mean, it's their choice to make. Just not a choice that I'd make as community manager.