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

>>175
Already covered by >>174, notice the "e.innerText.replace (/[^a-zA-Z]+/g, '')" bit. The result on >>175 is "♥♥ >>174 ♥♥ ♥♥ ♥♥ ♥♥ ♥♥ ♥♥", so even more love than in >>173 which is merely "♥♥ >>172 ♥♥".