But I can tell you for sure why some will get their posts marked in such a way, it's mainly because they try so much to write down a post like it's fucking essay that you're getting a mark on every single phrase that they end up with one huge wall of text that spins the same idea which stops looking like being normal text written by human and more like some machine. Let's not even mention the 3-4 liens quota, some simply force themselves to make that number of words characters, and of course when you try to stretch a 4 words phrase into 100 it it stops sounding human.
I envy the way you express your views in a clear but concise form @stompix. But people mostly from non-English speaking nations sometime can't express themselves accurately. So they feel one of the ways to further clarify their point to make the reader understand is to repeat their intentions using other words to avoid misconception. I am guilty of this shortcoming. Some writers want to express themselves comprehensively. They want to write it the way it flows from their mind, which is why their post most times are long. I am also guilty of this offense. I will have to improve my expression in the English language and also consider the length of my post because I will never want to be called a bot.