This sucks and I totally understand you and others are upset.
The rules on Nostalrius is pretty clear though:
Nostalrius Begins recognizes all valid play styles to be part of the game
https://en.nostalrius.org/terms-of-useWhat this means is that as long as they are not exploiting bugs, hack, multibox, safespot or similar it's all allowed on Nostalrius.
Pottu expressed this in a pretty clear way in an other thread (that issue was about cross-faction cooperation to farm devisaur leather and gank competitors)
by Pottu » Sat Feb 13, 2016 10:39 pm
Greetings,
if you suspect a player of multiboxing (or account sharing, gold selling, botting, etc), please make an in-game ticket (red question mark -> stuck -> still stuck, page a GM) and write the names of the characters in the ticket. We will then investigate.
As our terms of use currently stand, Devilsaur farming is allowed, even if it involves cross-faction cooperation. If you wish this to change, you can post in the Suggestion forum and describe in detail the change you would prefer - posting there, however, does not guarantee that the administrators agree with you.
The GM team.