There were plenty of login issues with Google accounts as well for days following launch in the US. I think you could attribute issues primarily to the way they

There were plenty of login issues with Google accounts as well for days following launch in the US. I think you could attribute issues primarily to the way they did load-balancing though. The app assigned you a server at login time, so if something happened to that server or it got overloaded, you were out of luck until you restarted the app and logged in again. I would guess this probably caused cascading failures of servers as thousands of users got booted from one server and then all put onto the next one in line when they realized their app had frozen and logged back in. Don't forget that at launch it was common for users to have to restart their application and re-login every time they caught a pokemon. A real dynamic load-balancing scheme would probably have solved their issues. Maybe Pokemon trainer club login went down, but there were still plenty of unrelated server issues for those using Google accounts as well.