I'm thinking particularly of the half a dozen or so "Read a book from every country" challenge. I don't necessarily mean that there could only be one challenge of a particular type, but it seems like we're losing a bit of the point of a public challenge like that when people are split across multiple challenges and you don't get all of the benefits of having a bunch of people recommending books for a prompt. Like there's 10 people doing one challenge, and 200 doing another, then those 10 people are going to have a lot harder of a time benefiting from other people adding books to prompts, even if both groups are doing the same prompts.
Maybe something when people are creating a challenge there's a pop up that says "Here is a challenge that already exists, is this what you're trying to create?" or a way to import all of the books from a prompt in a different challenge to the same prompt in a challenge you're working on. Maybe just a way to sort the challenges by number of people or number of books added.
Hello! Sorry I missed this one! We have tried to minimise folk repeating challenges by including a note in the guidelines asking them to please check if one already exists before making it public, and if so to maybe just keep it live so we don't end up with a tonne of repeats. But obviously we don't want to limit folk too much and basically say 'no, you can't also create this challenge!'
But we're bringing in some improvements to RCs soon, where you'll be able to sort and filter by number of participants, so at least you can join according to those filters!
What you are suggesting @alexhelme already is possible for hosts, they can add or even hide books added to prompts, so I'm not sure it would address what @kestrellady is imagining...
Or a way to make collaborative challenges where people could add prompts to an already existing challenge and the original creator can choose to accept/publish that or not! Something like that