Ironic that you are talking about unrepresentative samples while characterizing Reddit users that way. Reddit is a huge subsection of the internet, over a billion monthly active users. It covers basically all strata of western society you can think of.
I have to ask - are you a bot? You seem to be making some very strong and misinformed statements here. You can fixate on the number if you like, but calling Reddit homogeneously radical left or 'very small', is pretty stupid.
They seem to count unregistered users in the D/W/MAU, but even so the producer / consumer of content ratio across social media still stands. What you read is a subsection of all visitors to Reddit, which follows the power law.
