If a UTXO is banned from coinjoin participation (whether it is due to DoS protection or from blacklisting), the user is showed a message that says "Some Funds Are Rejected From Coinjoining" and a /!\ symbol is displayed next to the UTXO in the coin list which can be hovered over to show the unban time.
You should start thinking about introducing one more message that will be a bit longer. It could say something like this: We thought that working with blockchain analysis would give us a free pass in the eyes of world governments. We expected they wouldn't take any action against Wasabi and perhaps whitelist us. Unfortunately, we have failed. Any bitcoin you run through our protocol will be considered dirty and tainted. Thanks for supporting open-source software and the premier privacy tool in the world.