I edited it, not SN. It is synonymous for those big players. Read [Sanctioned party A] as any address on the OFAC sanctions list, including any particular big player you want to mention but I don't wanna.

The problem is that your wallet will be associated with these sanctioned big players by the preferred blockchain analytics vendor of every US 3 letter agency in the scenario I just wrote for you. Most exchanges will confiscate your coin and close your account.

Let me write you an easier scenario: you sell Bob a brick of gold for bitcoin. On-chain. Bob sends you coinjoined funds. Your funds ARE tainted. Do you lose your right to self custody?