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

The all caps pacifier >>185 was already provided in https://dis.tinychan.net/read/prog/1619688596#reply_2 and has a common root with the heartwalk >>178,179 decorator and the tree walk of the virus filter >>148,152,174.
(node => {
const walk = (pred, proc, node) => {
if (node.nodeType === 1) {
if (node.childNodes) {
for (let n of node.childNodes) {
walk (pred, proc, n)
}
}
} else if (node.nodeType === 3) {
if (pred (node.data)) {
node.data = proc (node.data)
}
}
}
walk (s => /^[A-Z]+$/.test (s.replace (/[^a-zA-Z]+/g, '')), s => s.toLowerCase (), node)
})(document.body)