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

To count the racial slurs in >>7:
>> (n => document.querySelector ("div#reply_" + n + " > div.body").innerText.trim ().split (' ').length) (7)
261

For comparison: https://dis.tinychan.net/read/anarchy/1594578572/13-17 "Deleted replies"