This is a net-split. A net-split is when the connection between two servers is broke, therefore rendering all the servers hooked up to those disconnected from each other. BOTs are often set to auto-op, kick, greet, and more. BOTs can also be used as remote tools, with the BOTs owner sending in remote commands to force the BOT to do tasks. Much of IRC find BOTs owning.
Many servers ban BOTs.
I on the other have no problem with a BOT if it is not annoying. They posses many commands not given to normal chatters. Ops are sort of the caretaker of each channel. They can kick, ban, and much more that other people can not do. Sometimes, Ops are not all good.