[bastardoperator]

If it's online, it's full of cheaters. One of the major problems (with steam) is the price of games in different regions. While a game might me cost me/you 20 dollars, it might sell in say Russia for 4.99. Add a popular steam sell to the mix and now we're buying licenses for pennies on the dollars, maybe even less than a dollar. We can cheat with these accounts or sell them to other cheaters for double the price we paid. Now cheaters can easily access new/fresh steam accounts and never worry about getting banned on their main account.

It's almost sad to see how badly anti-cheat software works. There are entire economies built around cheating. We used to combat this by being able to manage/run our own game servers with staff dedicated to the experience but very few games still support managing your own server. It will always be cat and mouse.