That's also true of aut-ct (which is private proof of utxo ownership) and proof of work. But in any case I see nothing wrong with a user paying several relays, separately?
Users paying relays directly goes against decentralization.
I am not sure about aut-ct; would't a proof of utxo ownership cease to be valid once you do not own the utxo? also, how do you do rate limiting with that?
I am not sure about aut-ct; would't a proof of utxo ownership cease to be valid once you do not own the utxo? also, how do you do rate limiting with that?