Probably, in such a situation, it can be advised to sell Bitcoins through intermediaries who do not care about the “purity” and “whiteness” of the coins, and use the received fiat money to buy “white” Bitcoins. 
For example, Bitcoins can be purchased directly from miners.  You can also purchase previously confiscated bitcoins from government officials (at special auctions).  You can also buy bitcoins on centralized platforms that support KYC and AML procedures. 
Overall, all of these problems arise because Bitcoin, unlike Monero, is a non-fungible coin. 
Each Bitcoin has its own transaction history.  The Bitcoin blockchain is transparent.