Will the wallet app itself start implementing some warning/alert option to inform the receiver that the coins are "tainted"?
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.