fansubs do know about whats going on.
I'm sure you've read the Bleach7 spoof sub on Narutofan.com, people like these fansub groups are sick of having their hardwork (which is intellectual property) be stolen and used for PROFIT, without any compensation.
That is the problem we have with Tazmo. Sure, it'd be all good if he paid Inane, Dattebayo and all the other fansub groups he steals from. But he doesn't, and that is the heart of the problem.
He's STEALING INTELLECTUAL PROPERTY.
Whereas other sites such as this one, is only being a re-distro source, where people can get the manga for FREE. Which allows the fansubs to get more exposure.