Are there Bullet chess bots (as if human players) on Chess.com?

The most of my lost games to low-rated opponents were to those had no avatar and filled profile. More than that the most of them played like monkeys (very weak, start level play) but they were supersonic players. They never answered in chats or to private messages. All of these facts let me make a hypothesis that there are a lot of bullet chess bots (as if human players) on Chess.com. If it is really so, it is very sad story.