So it is just a bunch of opensource tools (snort, clamav...) with a frontend. LOL
And what's wrong with that?
A cloud lookup virus blocker, wtf, this is a huge privacy issue. Even if it just transfers hashes, it would know everything I download.
That's how a lot of modern antivirus software work now. Local based signatures are half useless as they would be far too large, and require constant updating, so most of them now leverage the cloud for more accurate detection.
An hash isn't enough to identify "everything you download". They have databases of known bad files, not of known good files (which would be endless!)
Sorry to be so negative, but I'm just sad, that so many companies make their profit with oss, while the developers behind these projects can't even pay for their server costs, e.g. bsd, openssl etc.
I can't speak for Untangle, but I'm aware of at least one company that sells routers loaded with customized firmwares, which does send money back to the developers of those software projects. I know this for a fact because I've received donations from that company in the past (and they don't even sell products running my firmware, but the Tomato code they ship with does include some of my work.) And, you also have others that will sponsor development. Fairly sure the snort devs are well compensated, considering they also sell a commercial product, and considering who owns them now.
Yes, some companies are a bit "rotten". I know a few that take open source projects, customize it, resell it, and never give anything back (neither money nor code). But that doesn't mean they are all like that. I'm not very familiar with the Untangle folks, but I have no reason to think they are part of the rotten ones at this time, unless proven otherwise.
So no, nothing wrong with companies selling a product leveraging open source products, as long they do it properly.