Oddbean new post about login | logout There is no Bitcoin transaction that appeared in the mempool which has not gone through (excluding purged low fee transactions but that is not censorship). Eventually all transactions from mempool will be added to a block.
But not everything thats added to the block can be spent. Eg tainted coins or deannonymised coins (that is any bitcoin) on a watch list. Which means Bitcoin is no longer fungible.
They can be spent and sent to any address in future block. Such coins you mention can be confiscated or frozen when sent to regulated entity but they are still technically spent. Solution is p2p economy and avoiding compliant entities as much as possible.
They are censored in the sense that when those transaction move you can be seen moving them and the state/police can act accordingly. They can't spend them, but they can stop you from spending them without their knowledege.