Jagex community manager Mod Ayiza made the following announcement on May 23 via a blog post stating that:
”With advancements in technology helping to further support both RuneScape and Old School RuneScape, our tools are no longer compatible with Classic. This is particularly a problem with our community safety and macro detection tools. The game is now easily abused with the use of 3rd party macro tools, and botting has become an increasing issue.
We’ve not fully supported RuneScape Classic for years, so why are we suddenly seeing it as a problem now? The truth is that bots and lack of community safety tools are serious problems, however, we also feel that we can no longer offer long-term service reliability due to the growing risk of unrecoverable game breaking bugs.”
The RuneScape Classic servers will go offline at 8:00am BST on the 6th of August 2018. After such date, it will no longer be possible to log in to the Classic game. But till then, you can to continue playing as normal up until that date.