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They do and it protects their computers not yours! Your basically a pass through for them. They provide a connection from your house to the superhighway but they do very little to monitor what goes on. They have some filtering software and some systems to check your system if they are having a problem due to your machine being used in a DDOS attack or being subject to one. They also have some software that keeps track of your bandwidth usage. Yours may be unlimited like mine is on a monthly basis but if your running a business that is really bandwidth intensive you'll hear from them about changing the type account you have. That's especially true if your pushing a lot of graphics to others. It's to protect their bandwidth that costs them $$$ and if it's eaten up by a DDOS attack causes problems with their other customers not getting the service they are paying for. Never leave it up to the ISP to protect your system anymore than you'd leave it up to the street and roads department of your local city to provide burglary protection for your house.