As for the legal parts, if you hadn't heard about it, very recently a judge removed an injuction that prevented sites from linking to other sites with questionable content, until it can be proven that linking to another site IS illegal.
Another thing, ztnet hosts mame.net & cps2shock, well guess what?
Mame.net & CPS2Shock are both violiating the DMCA and could get ztnet is a shit load of trouble, very much so more trouble than just linking to emuchina or ace roms or any of the other major rom sites.
Also, the forums violiate the DMCA act and could also get rg/ztnet in a deep load of shit.
So why not have a forum to allow people to ask/answer about gets roms?