It's not so much what it does to the computer but what it does to your web and email access

It blocks access and emails to and from any host computer which is implicated by any AOL user in spam or malware. But it does so even if that host was phaked onto a spoof email.

eBay is very often blocked by AOL because of the phake phishing emails purporting to be from eBay.

AOL software is garbage..

It takes over your computer,slows it down,etc.....

The last good AOL version (If any) was AOL7.0ca (canada) -- That version wasnt nearly as bad or bloated.....

I've never even used it before myself, but from what I've heard about it, it's horrible. I know people who have used it and are currently boycotting the product.