Main stream media are the media who used Assange's stories when it became clear they couldn't ignore them; then helped to smear him while ignoring his torture and a long list of disproportionate and illegal actions against him.
You can call them scumbag media, billionaire media, or tool of the warmongers media; but pre-judging people who use the term "main stream media" means you have chosen the side of the opulent oppressor, and willingly put up a wall of ignorance for yourself. Seems dumb, especially on a thread discussing this story of all stories.