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

Upgrade of >>304 to summarize the recent runs of single-word posts.
((body2id, pred, handoff) => handoff (Array.from (document.querySelectorAll ("div.post > div.body")).filter (pred).map (e => [e, body2id (e)]).reduce ((acc, [e, id]) => {
if (acc.length === 0) {
acc.push ({a: id, b: id, bodies: [e]})
} else {
const last = acc [acc.length - 1]
if (id === last.b + 1) {
last.b = id
last.bodies.push (e)
} else {
acc.push ({a: id, b: id, bodies: [e]})
}
}
return acc
}, []))) (e => parseInt (e.parentNode.getAttribute ("id").replace ("reply_", ""), 10), e => /^\S+$/.test (e.innerText.trim ()), runs => runs.filter (({a, b, bodies}) => b - a >= 1).forEach (({a, b, bodies}) => {
bodies.forEach ((e, idx) => { if (idx > 0) { e.parentNode.parentNode.removeChild (e.parentNode); }})
bodies [0].parentNode.outerHTML = '<p style="border: thin dashed; text-align: center;">' + (b - a + 1) + ' micro/pol/cels</p>'
}))