There are a couple of channels i see that are re-streaming US television content that I'm sure they don't own. (very high profile programming, also its obviously a direct feed from a cable television channel)
Is there somewhere to report this type of thing?
Channels: Go Live Sports Cast/Spectrum Audiobooks "All I've had today is, like, six gummy bears and some scotch."
They don't reply to every email but at least it's reported for them to generate a case. Most of the cases that are prosecuted are publicized on the fbi website after the case is finished (which could take years). Their feeling is if you are not the criminal then you don't need constant updates on what is going on.
Seriously, you might be able to get questionable channels removed from Roku but there is just no way to stop movie or TV show piracy. There are even some apps/services that I don't understand how they can be legal, but at least for now are not considered illegal. Justin.tv may be the one the OP is referring to, as there is a fair number of DMCA violations there. Problem is, it's just like youtube in the fact that they don't provide any video and as long as they comply with the DMCA and remove channels when notified of a violation they are not breaking any laws.
Roku 3 Roku Streaming Stick Fire TV Chromecast G-box Midnight MX2 (retired) Various mini PCs running OpenELEC or XBMCbuntu (retired) OTA live/recorded tv - cheap indoor antenna + MythTV + XBMC