I heard it's something like 90% of people lurk, 10% of people comment, 1% of people post. So you need a pretty substantial population just to have enough posts and comments for the lurkers to still hang around.
It's also why it was particularly dumb of Reddit to piss off their 1% and 10%.
At least 10 or 15 years ago was when I first got informed about it. It's likely been problematic for much longer. Its really not that hard to use the word "women" instead. Usually when people refer to men they use the word "men", so it's only fair to use women also. Females feels a bit icky tbf. Like women are a different species or something.