I highly doubt anyone could do that much on public relays with rate limiting. If you are not rate limiting you are begging to be dos’d

If you’re fine with blowing your note budget on ephemeral event spam then great! you are limited to 6 notes per minute on the damus relay, would be very slow.

if you want to build on top of this then fine, but I can’t see it being a reliable protocol for arbitrary relays. I would build a special purpose proxy for this use case.