It obviously can't. If your coins are refused, you have no idea if it is due to Sybil attack or if Coinfirm has simply decided your coins are naughty and are not allowed to be coinjoined.
You would know because the coin is private, therefore it can't be refused due to its history.
What if:
- I don't have private coins?
Then get some if you are really that paranoid about testing for Sybil attacks.
Lmfao. "Use a different service to make your coins private before using them with Wasabi" is the best take I've heard yet.
Or, you know, just skip that second step and just use a different service altogether.
