No captcha?

Hello,
I am learning programming and just discovered this website. But I am curious, how does it protect its users from spammers (people who post illegal or annoying things) without a reCaptcha? I thought clicking this blue box is required to prove that you are not a robot, can you please share any javascript that you use for this purpose?
Thank you and have a nice day,
Brian

>>318
Nobody is arguing with you.
Nobody is suppressing your opinions.
Nobody cares about your opinions.
Nobody here is a /pol/ user (nigger is just a fun word to say)
I'm probably more of a leftist than you are.

All of your enemies are you in your head.