Peacock is primarily an on-demand streaming service with thousands of TV shows and movies available at your fingertips, and it also streams live TV. Well, sort of: Unlike YouTube TV or Sling TV, Peacocktv.com/tv doesn’t carry live-right-now cable or local channels, but 24/7 loops of content from its library divvied up into dozens of “channels.” Ever used Pluto TV or Sling...