Like Mozilla foundation, which has a number of separate "initiatives"
Or Wikimedia, which partially works on Wikipedia.org website, but also works on a number of projects not directly related to the main website.
Sometimes there is only one charity that covers a certain topic so if they also do other things you don't want to support the only choices are to make a restricted donation or to not donate at all.
Like Mozilla foundation, which has a number of separate "initiatives"
Or Wikimedia, which partially works on Wikipedia.org website, but also works on a number of projects not directly related to the main website.