What is not a good job in the world of Yu-Gi-Oh!
(Quick answer) Of course not playing cards!
One day, a certain god who worked hard to repair the world line finally broke out amidst the daily trials of being on the verge of death from overwork. In order to reduce the burden and to entertain herself, she casually threw some power into several parallel worlds.
So the story begins like this.
In every generation of Yu-Gi-Oh's works, there is a female character, whose profession is basically not a duelist, and they are not designed for prostitution, girls who have their own lives.
All parallel world settings, except DM and GX, may be slightly related, but not major, and there is no direct timeline connection.