Being legally allowed to do something doesn't make it morally or ethically okay. Wikipedia is not absolved from criticism just because they aren't breaking the law.

I think this article is silly, but I'm responding to you in a more general sense.

The problem is that Wikipedia masquerades and is portrayed as though it’s just an online encyclopaedia that can be trusted by one and all.

Most HN readers know otherwise and have a pinch of salt on hand if they use it but your average high school student isn’t going to be aware of the systemic flaws of Wikipedia and I doubt their teachers do either.