Not just porn! Since reddit only has one such tag you can apply to posts, many subreddits were using the NSFW tag for a wider variety of reasons such as spoilers, content which may contain unsettling material (aka “triggers”), and more!

Funny how you seem to believe that “checking stock prices” is a good use of a whole monitor but don’t seem to see how literally any other task could benefit from having reference material up on a second monitor.