The main reason to do captchas nowadays is to keep the door closed. Of course they do not deter more expert-ish people, but opportunity “hackers” aka script kiddies. If you’re not using captchas you’re just inviting them to run a script on your site. Big sites use captchas, there’s no reason for the fediverse to not use captchas. We don’t need to be “special” in regards to security.
That account is just outrageously blatant, I would have given them the benefit of the doubt if it was just one article, although I still would have been very cautious of my doubt, but they posted 6 of these type posts