The problem is the arms race escalates forever - cheat developers will just regroup, analyse what the new VAC is doing, and start finding new exploits.

Not saying Valve should just give up; quite the opposite. The war never ends.

If you like American football, big recommend for Retro Bowl - as the name suggests, it’s an old-school arcade/NES style game heavily inspired by Tecmo Bowl. Plays really well on mobile, and has a small premium charge to permanently unlock some nice extra features (e.g. roster customisation).