You are ‘free’ to change groups, but most groups have a process for joining, and not everyone who wants to join is able. And you will have to move to that group’s territory.

Also, I am not sure what you mean by ‘no problems with it’.... this is an anarchy, there is no one to bring those problems to. Some people trying to conquer others is just a part of being in an anarchy. Some people want to conquer.