The bitcoin creator, Satoshi Nakamoto created Bitcoin mining to be permissionless and censorship resistant, but this newly created mining pool are now censoring Bitcoin transactions, making it to be permissioned protocol.
Marathon Digital Holdings’ (MARA) new mining pool has mined a bitcoin (BTC, -2.01%) block that is “fully compliant with U.S. regulations,” meaning the company has started excluding transactions from entities it believes are sanctioned by the U.S. Department of Treasury or have been involved in dark web activity.
The Marathon OFAC pool, which was first announced in late March, “refrains from processing transactions from those listed on the U.S. Department of Treasury’s Specially Designated Nationals and Blocked Persons List (SDN)” to stay “compliant with U.S. regulatory standards,” according to the company.
What is this mining pool driving at? Againsting the make up design of Bitcoin mining protocol?
Just to market their mining pool? That is obvious in the below quote.
“By excluding transactions between nefarious actors, we can provide investors and regulators with the peace of mind that the bitcoin we produce is ‘clean’, ethical and compliant with regulatory standards,” Marathon said in a statement.
Yet, this is not yet entirely true
Despite Marathon's efforts, transactions from a dark web market still made it into the block.
https://www.coindesk.com/marathon-miners-censor-bitcoin-transactions-ofac-compliant 
