Let’s say someone’s family was in the army, so they moved around a lot from birth, and they didn’t really have a ‘home,’ but they’re into sports—how do they choose their favorite team? Do they just decide to hold off until they move somewhere permanently, and then choose that city’s team as theirs?
You can do whatever you want. You can be fans of multiple teams, or none at all. You can even bandwagon and just be a fan of whomever is winning currently.