Why many cheats need x64 OS?

The x-trap anti-cheat system always updates and it detects newer cheats, but some cheats need x64 OS to work.
And that cheats are not detecting if they not using some programs for automating (ex. AutoIt, HotKey).
Why the x-trap anti-cheat system can't detect those cheats if they are using WIN64API dll ?

That's because many ac's uses drivers to protect their memory and they only work on a x64 bit operating system.

because these Protect in x64 os not strong!