The problem that I have with these anti-hack utilities is that you can be told that "We caught you cheating." And that's it. You can't argue back, you can't even ask for the specific case report. It's like if the police busted down your front door and took you to jail because one of them didn't like the way that you looked, and thought that it was suspicious.
Also, even though it is clearly illegal (remember the Sony Root Kit?)companies will install software on your computer to monitor what you are doing without your knowing consent. Not too long ago Microsoft did this with their security validation tool, which is capable of tracking your mouse movementsand called it a security update. Soon, all software will be spyware, constantly reporting what you do with it to whoever owns the copyright, in an attempt to enhance your customer experience . Satellite companies are capable of monitoring what you watch, and so are digital cable companies. Have you noticed how a lot more channels have commercials airing at the same time?
Once, (in the US that is) privacy was considered a right. Things like keeping track of what you purchase would have been considered illegal. Now, many online sites do just that, and hide the fact within an obtusely written EULA. Which is a legal and binding contract, not an outline. From what I have read, Valve and most other companies need to update their EULAs because most have a certain little clause in them that states that the EULA may be changed at any time at the companies discretion without notification. You could definitely get Valve into legal trouble because they do not explicitly dictate the monitoring methods used to detect cheating, which means that they could (note the could, I am not saying that they are) record your ISP logins and your windows account information, heck they could keep track of anything that they wish and say that its all an attempt to ensure that you aren't cheating. You argue against it, and they point out that you agreed to it, even if the EULA had changed since you had "signed it."
If the EULA wasn't a legal and binding contract, then any attempt to enforce it (especially the disabling of the software, or the monitoring of your use of it)would in fact be illegal and a violation of your privacy rights (in the US.)
I believe that in Holland (or was it Denmark) that Microsoft was fined and had to recall thousands of copies of vista because of the DRMs present in the version of Media Player that violated that nations privacy laws.
My point, and the on topic point, is that these companies have no actual right to take away access that you paid for without giving at least some proof of the incident, and a reply other than VAC2 does not make mistakes. That's what a certain religious entity said about Galileo, and we all know how that turned out.