An undisclosed number of players have decided to exploit bugs, not responsibly disclose them to staff to be fixed, and instead go hog wild on every game world. Because of these people, we have to turn all of the game worlds off, clean up the player databases, which may involve rolling back some if the damage is severe enough, and figure out how to fix this on our own.
Items of high value were duped quietly by a few and then when certain individuals were muted/banned, they doubled down and went nuts on all of the game worlds. A significant number of rare items, dragon items, and wealth have been created and many innocent players have been getting them through drop parties, auction house, general store, and trades (depending on which world). This is a major clean up in the database that volunteer staff have to take time out of their personal day to now attend to.
The game worlds will be offline for a period of time that we are not sure of yet while we manually deal with this huge mess. Thank you for being patient and understanding. Discord and website will remain online but the game worlds will be offline during this process. If you would like to play single player RSC, you can download the game code and run your own version at home on your PC. https://gitlab.com/open-runescape-classic/core
On a side note: we have the ability to trace the life of an item individually, can see the duping occur in the logs, and will be building automated detections to alert and nuke this behavior going forward.
Also, if you really want pest control, maybe it will happen

From Kenix:
(ETA will be) "When we figure out all of the dupe bug(s), fix them, and prove it to ourselves. Then time to investigate the logs and decide on a rollback or manual fix, then apply the remedy. We all have day jobs, so this will not be quick. We are sorry. "