They're easy to spot when you know what to look for. They are usually very long pieces, Not the 3-5 min garden variety. If you read some of the "writer;s" early stuff you'll see a noticeable difference in style and length. Most of the pieces won't make any sense. I Looks like English and if you read it out loud it sounds like English but it's just words.

There will be a lot of headers. Then a few paragraphs of nonsense and then another header. Most people on here use section breaks (- - -) or images with citations to break up texts but not AI.