Idk why but this past week I've been seeing this wayyy too often. I've seen 2 issues with this so far.
1. Players are putting in trade chat ridiculous offers that will make almost everyone whisper them, then you see they are in DND mode with some bait message. Tbh I was laughing at first but it has been happen a lot recently.
2. Either players are trolling or are completely unaware that they are in DND mode like the photo below.