/b/ at its core is chaotic. It is, because that is the protocol (no tripfags). Nobody has an identity. Only the memes matter. And then only the memes who are victorious for the fight for the frontpage. It is evolution of ideas.
So at the end you don’t have a clue how the whole userbase looks like. A femanon would identify as anon too. Someone with kids and a family would identify as a basement dweller still living with his mom. It is all part of the game.
You also won’t have a clear view on why a meme exists. Just like it senseless to ask ‘Why do we have eyes?’. The only correct answer is:
It was a process of chance and many iterations.