Why are these TLDs so tightly bound to a specific organization? Why can't their registration be more open? Keeping them so locked down makes them useless. Or am I misunderstanding something?
> and hence had a say in what can be registered on that TLD and by whom.
Not quite, assuming we're not talking about .brand, they have to make them available for purchase by the general public. However, they do get to dictate prices.