Most popular servers use GameGuard, ReHLDS, or specialized AC plugins . These don't just ban you; they can "destroy" your game files or redirect your menu to troll servers.
Unlike heavy "Multihacks" that come with a complex menu (GUI), a standalone DLL is often preferred by players looking for a "cleaner" experience or something that can be easily hidden. Top Contenders for "Best" Aim DLL
The modern CS 1.6 "modding" scene uses MetaHook. While often used for HD graphics, some developers have created aim assistance DLLs that run through this framework. More stable on Windows 10 and 11. Cons: Higher learning curve to install correctly. 3. "Leis" or "WarHacks" Derivatives