You cannot interact with anyone in a coinjoin, and even if you could, it would no longer be trustless.  Let me pose the question again:  If Alice refrains from interacting with any other coinjoin participant, as is typically expected, can she discourage the coordinator from sybil attacking her?  From what I can see, she cannot.  Hence, WabiSabi remains highly susceptible to sybil attacks (launched by the coordinator).