Its really not, it has full server side simulation/verification, PUBG has none and is completely client side for instance. The only viable hacks in CS:GO are a

Its really not, it has full server side simulation/verification, PUBG has none and is completely client side for instance. The only viable hacks in CS:GO are aimbots and extremely limited wall hacking (basically you can see a few "feet" around corners, the server does not send you any other data). This compares to PUBG where you can press a button and headshot the entire map at once, while flying through the air and spawning guns.