The damage done by these things is quite real; even at the website I work at, which is mostly internal to Michigan State University, we've had some trouble with people using AOL to access the Job Postings page (our most popular public page by nearly an order of magnitude ). AOL's interception proxy was rendering our pages unreadable, even though the AOL browser was perfectly capable of rendering the page, because AOL processed the graphics and destroyed them in the process. In addition, the AOL proxy was serving old copies of the job postings page, causing people to apply for jobs that had already been filled; and worse, not applying for the current jobs.