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

fornicate >>251

samus/palutena >>73 | blake/yang >>76,79 | elsa/anna >>112,120,170 | tifa/aeris >>142,160 | starfire/raven >>187,189

Smoking >>305
Hot
Awkward
Klutz
Incestuous
Naughty >>255
Girlfriends https://rule34.xxx/index.php?page=post&s=view&id=1533326