To be fair, just searching for "plex" does return Reddit results, though not on the first page (for me anyway, Google personalizes search results). It's no longer the Wild West of Internet, and it turns out information doesn't want to be free, it wants to live in invite-only areas who's members are vetted before invitation. DMCA take-downs can't be sent if the material can't be found.
Anyone with a tiny bit of Internet knowledge is going to know how big a site Reddit is (#6 on Alexa for the US).
To be clear, I'm willing to pay for content, and have a small library of shows and movies sprawled across Google, Amazon, and Apple's offerings that I "own", it's just far more convenient to have all my media in one place: Plex.
Everyone does a bit of pirating here and there, and I think the media companies realize it's a cost of doing business. But something tells me they wouldn't look too fondly on an organised, multi-user pirated content distribution platform...
Here in Canada there are some big chains (Best Buy, Staples) being sued for telling people at point-of-purchase that they can watch free content on an Android box.
This is why they are "peer to peer". The bittorrent protocol for example downloads files in fragments, and every fragment that you have downloaded becomes available for other clients (i.e. you start becoming a server as soon as you have downloaded one fragment)
I don't think there is a fundamental moral right to a particular pattern of bits in the first place to defend.
btw if anybody wants to add some goodies to plex, i created browser extensions that add trailers and random sorting. check them out!
Edit: I think iris was something I did more recently, I don't remember what it was using originally. I just wanted to play with go a little bit. The "front end" itself is a single page with an upload button and a box to paste a magnet link, it's not like it's doing much. Plex does all the real work here.