User blog comment:LunarWing/Gameplay Controversy/@comment-7395018-20140202061903/@comment-11356046-20140202163118

Crouch spamming is unfair because a majority of the time they use macros (which is against ToS) to crouch really quickly which causes hit registry to go haywire because their hitbox is shrinking and enlarging, mostly many times a second

This is why in CS:GO they have a slight cooldown for crouching so a player can't spam it. Also jumping has a cooldown too so no bunnyhopping either