I think that this sentence encapsulates everything:

Another interesting point is that some communities have moderators who aren't very familiar with the English language; they mostly use translators.

To me, AI generated articles (and comments) feel very different to human written. I can "feel" this in the writing style and this "feeling" could also be linked to some of the work I've done trying to "humanise" AI generated content. When you try to get AI to write like a human, you quickly discover its limitations - which can be overcome with a lot of effort - by which time it's quicker just to write it yourself anyway!

In many ways, it's no different to detecting plagiarism - where somebody has adapted content to avoid detection from tools. You know when the writing style's different and it amazes me how often somebody can't string a grammatically correct sentence together but can write a perfect Crypto article.

The best solution - only support articles that "feel" authentic and "must" be authentic. Opinion based, rather than a list of facts or trying to teach something. If somebody's trying to teach you something - whether it's "10 reasons that a dog shits outside" or "An Introduction to On-Chain Finance and its benefits" - you can be pretty certain that there's been no Proof of Brain involved.