Whoa! Until now I haven't even knew about this. Now I'll definitly stay away from steam.
For instance let's say I have several dozens of games bought through steam and then I get banned becouse of some false-positive detection and this would ban me acces to all of them. Are you serious. That is the most ...... I can't find proper words to describe this without breaking the forum rules.

Besides no software has the rights to scan my computer for other software without my explicit permision. Such programs are othervise refered as Trojans or Spy programs.