Since CoinJoin is overt on chain, I wonder if the certain services are more or less represented because of KYC-free culture, or just based on their volumes, or something else
The key reason Wasabi mixes have been so problematic for users is that their broken implementation creates proximity to known blacklisted UTXOs via their peeling problems.
Those don't exist for Samourai so either they block you for seeking privacy (most won't) or they let it fly because there is no proximity to blacklisted funds.
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At first blush that sounds plausible. I'm not sure how much one hop from blacklist tx0 input to equal-output makes vs direct input to equal-output in a practical sense. Since nobody is forced to repeat CoinJoin. Software they use to block could make a difference flagging in that way.
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