Guba rhymes with Cuba, so by association they are bad.
Newgroups do not sell peoples content, Joe. Newsgroups just provide a way for people who want to post content to do so. lolol.. Back in 94-95 or so I spent quite a lot of time figuring ways to strip newsgroups of their content.
Guba claims legality because they are only charging access to their interface, not the content. The content is free of charge on usenet and they are just providing a better way to get at it, sort of like google making it easier to get to web pages. (Not agreeing with them, just spelling out what their argument is, much the same argument Napster used and look at where that got them)
I am not sure which way to go on Guba. The newsgroups have been there and will always be there. People will continue to post copyrighted material on usenet because it is virtually impossible to stop them from doing so because it is for the most part unmonitored cyberspace. That copyrighted material gets into usenet has never bothered me because it is usually really a pain in the ass to get at the content with all the usenet spam.
Guba is making it extremely easy to get at the content, that is the issue. I think they are taking a big risk because they are (apparently) bringing the content into their own server and manipulating it there. That is what nailed napster I believe, because their servers were in the middle of the whole mess.