Because it's, well, a crime. At least in the US. The rights holders could theoretically come after ResetEra if it was facilitating access to this stuff. Ad networks may not be willing to advertise on your site if it's not all on the up and up. That's a can of worms I'm sure the site doesn't want to have to deal with.
It's not like piracy isn't silently acknowledged here most of the time. There's definitely a lot of looking the other way kind of stuff going on in discussions because no one actually wants to admit being a pirate (the chances of there not being a single person in that MiSTER thread who pirates stuff is zero), so it's not that it isn't commonplace. Every so often someone slips up and admits to it, either by accident (like the guy who was talking about his digital copy of a season of the show, admitting he didn't own the DVDs, and people finding out the show never had a digital release) or on purpose (yeah I downloaded the entire Gamecube library so what who gives a fuck).
And you definitely see the attitudes among gaming journalists or youtube personalities to be extremely lax towards it (most of the time), with a various range of giving a fuck about admitting it.
It's always been seen as a victimless crime, especially if you can morally justify it to yourself somehow (e.g "I'm not paying some random guy on eBay $500 for a copy of Panzer Dragoon Saga" kind of stuff).
But still, you know, a crime.