What's the point of an anti-virus on OS/2? Sure if it is working as a mail server or even file server for other operating systems, it could be handy, but otherwise?
It is always good to be sure that you don't, accidentally, pass on a virus to some poor, unsuspecting, unprotected, windows user. It is also possible for some of those XUL things to infect an OS/2 system.
You can also get yourself into trouble if you accidentally send a virus to someone. Some companies check mail, as it is sent, to see if their users are sending viruses. That can get you black listed, but usually the message just disappears into the ether (sometimes it doesn't have to be an actual virus, it just needs to be something that might be a virus). Even worse, is that a receiving server can detect it, and get your whole domain black listed. Somehow, all of these measures can't seem to stop the problem, but they can create problems for legitimate users.
I was using ClamAV, for a long time. A few months ago, it quit updating, and I couldn't be bothered to try to figure it out. It was also not usable, without using CLAMD, which uses HUGE amounts of shared memory space (mostly upper shared space, so that wasn't too much of a problem). I did add a script to PMMail, to run ClamAV as each message was received. That was working okay, but the overhead was pretty high. Over about 10 years, I only trapped about 5 viruses (two of which were false positives). The other problem was that only incoming mail was checked, I had to manually check any other files that needed checking.
As for Dr. Web, I would need a lot more information about exactly how it works, and the cost, to make any decisions. One option would be for somebody to buy 5 (or more) licenses, and sub license them (depends on how that goes over with the owners). It would probably mean that whoever does it, would need to do front end problem resolution. Overall, I can't see that it would be a popular item.