AFKs happen, commonly enough to be notable, whether malicious or not.

I have never seen someone repeatedly reenter a group they were kicked out of just to keep trying for a free lunch, though. This isn't common.

There likely is no code present atm for an instance to keep track of the people who have been vote kicked from the instance and prevent them from being able to reenter that instance, but there probably should be just to avoid cases like these.