Valve did nothing about cheating during last decade. Not even speaking they can buy source codes, but they can buy faceit and esea completely, with the developers, and make great anti cheat on the official servers. They simply do not need this, as cheating is driving market transactions and every transaction has a fee. In short words: cheating is profit. VAC is actually acronym for Valve Allows Cheating. What a shame and amazing disrespect to the whole CS community.