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

>>85

bumps thread every single day advertising some poor shithead's blog against everybody's request to stop

complains about getting called spammer

dubs >>11,22,33,44,55,66,77,88 | hentai >>73,76,79 | niggers >>6,24,33,45,74