Because some features in int.warrock is 100x harder to hack now than it was in 2007.
Due to so many hackers, they keep improving client and anticheat, making it harder to create detours and working hack features.
Level, dinar and premium are server-side for example. It will be impossible to hack those.
If you want a challenge, try hacking philippines or korean warrock. They even have still inbuilt GM stuff like shutting down rooms etc. (you need to find commands) which worked on this version too 2 years ago.
The reason is because those versions have less hackers, so their clients have less safeguards against hacking.