Groups allow information trading. It is basically essential if you want to cash for your hacking activities, such as carding and 0-day selling. I am not totally familiar with "the scene", but I'm pretty sure there are plenty of incentives for hackers to regroup
The most successful ones work for the feds while squirreling away the proceeds. The feds don't mind cultivating crime if it's increasing their numbers.
Actually, criminal copyright infringement is a $250k fine, 5 year felony, in the US. Pretty amazing. You are vastly more likely to be prosecuted criminally if you're part of a group, and especially if you focus on 0-days. Even more likely if you sell things, charge for advertising on your site, etc.
DMCA still makes some 0-day exploit research not totally safe, either. https://www.eff.org/wp/unintended-consequences-under-dmca I don't know if anyone has been successfully convicted, but a lot of prosecutions have come up, and that's enough to deter many people.
DarkMarket was an English-speaking internet cybercrime forum created by Renukanth Subramaniam in London that was shut down in 2008 after FBI agent J. Keith Mularski infiltrated it using the alias Master Splyntr, leading to more than 60 arrests worldwide. Subramaniam, who used the alias JiLsi, admitted conspiracy to defraud and was sentenced to nearly five years in prison in February 2010.
The website allowed buyers and sellers of stolen identities and credit card data to meet and conduct criminal enterprise in an entrepreneurial, peer-reviewed environment. It had 2,500 users at its peak.
