As the title said, this has been a severe issue for like 2 months. For example, bot will merge your party and change the lfg description to "Thank you for your report!" which annoyed many players. https://imgur.com/a/i6zc0bE I see many players say they are disappointed with the game and will quit.
From what I heard, Chinese Team has been struggling with it and banning lots of his accounts, but it seems no end. Also, Chinese Team once sent Anet an email for this thing a month ago, but didn't get any response. There is no other way to stop this, so I posted here, wish some dev can see this post and make some changes to lfg system.