Agree on your point, but I think a true valuation of the content provided free to reddit is astronomical.
I don't think 3 million is even in the same country as an accurrate measure of the worth of reddit content.
Just for being one of the "most useful results" on searches, it probably arranged for several billion in google ads.
As writers are now on strike, its hard to pin down exactly the hourly costs of writing a hundred thousand pages that people search for.