sv_cheats is a protected cvar. That means it's something VAC usually checks. It is also a Sever-Var... so...
Modifying a protected cvar => Insta-VAC Ban
I think some people can modify it without getting caught but it is still very risky and if you don't get caught in the first place, you will in the future.
These people will also most likely not share their code with no one, as it is very important and top secret.
^^^ I'm not sure ^^^