It seems there was a popular farming spot for linen. I don't think there's any point on hiding where, if you google "guild wars 2 linen farm", it's the only spot you'll find, all months-old entries. It was in Iron Marches, where some mobs spawned endlessly.
You killed them and they were supposed to give lots of linen. I've seen people claim 30g/h rates, I can't confirm anything. Most of them were farming it for personal use.
The second spot was for jute, in Queensdale, killing bandits. No idea about the benefits, and not sure if the ones banned for this participated in the other one above, too.
Lot of people from my server, many of them "important" people have been permanently banned for exploiting the game.
The Rules of Conduct clearly state the following: You will not exploit any bug in Guild Wars 2 and you will not communicate the existence of any such exploitable bug (bugs that grant the user unnatural or unintended benefits) either directly or through public posting, to any other user of Guild Wars 2.
The bug here was that there were 2 groups of monsters that were instantly respawning when they were killed. This bug was being abused by players in order to gain unintended benefit. These players were also communicating the existence of this bug to other players in their guild (and others), which in turn was luring those players to also abuse this bug.
While this bug may have existed since launch, the abuse of it was highly localized to a specific server and a specific timeframe. After our agents identified it as a problem, it was investigated. Our investigation showed that there were a high number of players abusing this issue, including a large percentage of users using automated macros and bots to farm these instantly respawning monsters.
This was abuse of an obvious bug, and action was taken against anyone caught exploiting this bug. The issue has since been fixed.
Please be aware that when a bug is identified, abusing it for gain is considered an exploit and may result in action being taken against your account. If you believe you have found a bug that can be exploited, please report it to firstname.lastname@example.org.
And just to be perfectly clear: the bans of macro- and bot-users are not discussion worthy.
Many people got the usual "compensation" (Heroic Edition goodies, the ones you get if you buy the game now, people on previous revoked bans got it too), and an apology letter. More still remain banned, and there's talk about one GM being faster/softer than others, in some sort of good cop/bad cop thing, but I hope it's just a matter of time for all the "wrong" bans to be revoked.
Edited by Baron von Scrufflebutt, 01 January 2014 - 09:38 AM.