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

>>360-364
The first three are already covered by the single-word filter >>304,311. All five are already covered by the repeat runs filter >>336. Send brighter /pol/cels.

>>367
Keep in mind that these people are at the level of mental stability where they might occasionally feel the uncontrollable urge to tell someone to die nearly four hundred times in three days. >>8,165

Stallman is a brave man fighting against unjust age of consent laws.