A significant part of Niantic's servers were overloaded with bot requests at that time, which caused massive lag for everyone. Banning was their only option. T

A significant part of Niantic's servers were overloaded with bot requests at that time, which caused massive lag for everyone. Banning was their only option. They came with a shadowban technique later though : https://www.theverge.com/2017/5/24/15686428/pokemon-go-niantic-shadowban-bot-hack https://www.theverge.com/2017/5/24/15686428/pokemon-go-niant...