This was deliberate, though I think I should've disallowed upper case letters. My thought was that some terms have very different meanings depending on their capitalization. Example:

• RAM = Random Access Memory
• ram = A kind of animal
• Ram = A brand of truck

Though in practice, making different capitalisations distinct seems to have caused more confusion than it saved. The most popular club is "Anime", with 3503 members. But then there's also an "anime" club with 119 members.

I'd be happy to accept a PR which transforms upper case letters in club names into lower case letters. That means that lots of clubs will need to coalesce, though it's possible to do with a single query involving the club and person_club tables, which can go here.