Not a single thing has been updated for Clubs to make them more accessible. Even the most basic things...
You can't renaming the Clubs full name can't be done. And you can't even just delete the whole club and remake it to preserve the clubs Tag, but rename the group.
You can't check a tags availability without setting it
You can't link to the club so someone can join without being a friend
You can't join more than 3 or have a group with 300+ people.
It's just another thing Riot added to the game and just let rot away because they didn't maintain it at all. Come on, Riot.