Which Team has the Fewest Fans?

The question seems kind of weird, but I’d really like to know what team just struggles to have any fans. Whether that’s at the games, online, merchandise sales, or anything else. I could go off of attendance, but I feel like that’s more of a sign of the stadium/experience than the team itself. And also: Why does this team not have any fans?

I love rooting for the underdogs, especially teams that don’t have a lot of fans or success. So I’m hoping to find the team with no World Series/the fewest fans to cheer for. The more irrelevant and unimportant the better! Bonus points to any teams with small but passionate fanbases.