Let's go by parts: * Wasabi only works with free coordinators, those which have no way to charge you any fee. This means that you are not "paying for" anything. * In Wasabi, there is no way to restrict the participation of others or to degrade the anonymity of others. This means that, for example, if in a coinjoin round there are 10 participants with a total of 40 inputs and an attacker enters with 400 inputs, the attacker cannot deanonymize any of the 10 participants. The only "damage" that the attacker is doing is creating the illusion of a higher anonymity score because for an external observer (other than the attacker) the anonymity score is indeed higher.