I am Greek and we don't use that many commas. Definitely not in this way. I think the Greek language is also not as flexible with comma placement as perhaps English is.
What I've noticed is that some people never learned how to use them. They just write a sentence (or a whole essay) and generously sprinkle some commas afterwards, normally wherever they would make a short pause. I've seen this with colleagues from Germany, Greece, Russia and the US.