Interesting that you consider "no fidelity bonds" to be a feature. Those were added to joinmarket to improve sybil resistance. Does joinstr have an alternative method to reduce the risk/increase the cost of a sybil attack?
Yes there are alternatives but not tested yet on mainnet
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Depends on the kind of relays users prefer to use for a round.
Example: If users prefer to use paid relays in a round then cost is decided by nostr relay
Also encrypted channels right now are not implemented, which it would help in reducing DoS vectors
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