Comment by clan

Well, yes. You are right.

But as I read the OP it is that he objects to the barrier of entry. He would prefer (possibly very harsh) rate limiting over the hassle of registrering an account. Maybe combined with a weak "nag" screen.

It might be hard implementing in a bulletproof way as IP restrictions are easy to circumvent. But it might be "good enough" to drive more adoption.

I'm a bit on the fence. It would be an interesting experiment.