Earlier quoted context omitted.
I've checked the Italian version of the article and I've noticed two interesting things: - the page was originally published in 2017 by user Swmmng without any content, just a random photo of blue sapphire [1]; - the second revision of the article [2], published one minute after the first one, actually has content, but it's clearly machine translated. So yes, it's a "clever" form of spam. [1] https://it.wikipedia.org…
That is strange… Why would wikipedia mods and admin let such obvious spam stay up?
One main aspect in play here is that we're dealing with over 300 sets of Wikipedia editors in different projects. Each Wikipedia language-based project is siloed, with its own complement of editors, admins, policies and guidelines. Sure, you can edit more than one Wikipedia from a single account, but there is typically a true community that coalesces in each one, and they set the culture and the rules of behavior.
I have found that many are less deletionist and less vigilant and more welcoming of new content in general. The majority of these articles may be under the radar for them. They may not detect anything wrong with the articles. They may not care. They may have too few editors patrolling in general, to clean up minor issues like this.
Another thing about the small communities that have formed, they often understandably do not always enjoy when an editor comes cross-wiki to combat some perceived abuse or vandalism. It is not what some user did on another wiki that matters to them, if a local user is not being disruptive, per se, then they should not be subject to any disciplinary action.
So if anyone were to pursue this seemingly minor issue of single-article spam, they'd need to pursue it more than 300 times in 300 different ways, subject to 300 separate policies and guidelines interpreted by that many communities of editors and admins. That's sort of a radioactive task for anyone there.