This is a special post for quick takes by Mati_Roy. Only they can create top-level comments. Comments here also appear on the Quick Takes page and All Posts page.
Last year, I checked Less wrong on the 27th, and found a message that told me that nobody, in fact, had pressed the red button.
When I saw the red button today, it took me about five minutes to convince myself to press it. The "join the Petrov Game" message gave me confidence and after I pressed it, there was no bright red message with the words "you nuked it all"
So no, not a trap. At least not in that sense - it adds you to a bigger trap, because once pressed the button cannot be unpressed.