> I don't understand e-sports teams. They're not representative of a geographical region ... I don't understand the convention for how spectators are intended to root for a team.

That isn't an e-sports specific phenomenon though. Maybe it's the case more with US sports teams, but in something like football/soccer you have teams like Manchester United that have a massive global brand that is attractive to people in multiple countries and may have zero connection to Manchester or England as a whole. People in other countries will choose a team at some point based on specific players they like, a certain style of play, or even who their friends/family are already rooting for. Formula 1 likewise is also just a pure battle of the brands. Pick a team, follow it closely, and cheer for them.